Pieced together from the MythTV Wiki, links on the Wiki, and my own knowledge/testing/experience/preferences.

Starting from a new, clean image of NOOBS:

1. Boot NOOBS
2. Open the Terminal

   • sudo apt update
     sudo apt upgrade
     sudo apt autoremove
     sudo rpi-update

3. Reboot
4. Open Menu → Preferences → Raspberry Pi Configuration
   1. Main Tab
      1. Change the password (to something secure)
      2. Set the hostname
      3. Auto Login: Off
      4. Splash Screen: Disabled
      5. Set Resolution (if necessary - Pi usually auto-configures the correct resolution)
      6. Underscan: Disabled
   2. Interfaces tab
      1. SSH: Enabled
      2. Everything Else: Disabled
   3. Performance tab
      1. GPU Memory: 256
   4. Localisation tab
      1. Set Timezone
         1. Area: Europe
         2. Location: London
      2. Set Wi-Fi Country
         1. GB - Britain (UK)
5. Reboot
6. Turn off Wi-Fi and Bluetooth via the System Tray (this should be the last time you need the mouse)
7. Open the Terminal

   • sudo su
     nano -w /etc/apt/sources.list.d/mythtv-light.list

8. Enter the following text:

   • deb http://dl.bintray.com/bennettpeter/deb/ stretch myth29

9. Save and exit with Ctrl+X, Y, Enter

   • wget -O - https://bintray.com/user/downloadSubjectPublicKey?username=bintray | apt-key add -
     apt update
     apt install mythtv-light cpufrequtils ratpoison autofs
     adduser mythtv
     adduser mythtv dialout
     adduser mythtv cdrom
     adduser mythtv audio
     adduser mythtv video
     adduser admin
     adduser admin adm
     adduser admin dialout
     adduser admin cdrom
     adduser admin sudo
     adduser admin audio
     adduser admin video
     adduser admin plugdev
     adduser admin games
     adduser admin users
     adduser admin input
     adduser admin netdev
     adduser admin spi
     adduser admin i2c
     adduser admin gpio
     systemctl disable raspi-config
     nano -w /etc/default/cpufrequtils

10. Enter the following text:

    • GOVERNOR="performance"

11. Save and exit with Ctrl+X, Y, Enter

    • visudo

12. Add the following to the bottom of the file:

    • mythtv ALL = NOPASSWD: /sbin/shutdown, /sbin/reboot

13. Save and exit with Ctrl+X, Y, Enter

    • nano -w /etc/lightdm/lightdm.conf

14. Find the line

    • [Seat:*]

15. Uncomment and modify these two parameters:

    • autologin-user=mythtv
      autologin-user-timeout=5

16. Save and exit with Ctrl+X, Y, Enter

    • nano -w /etc/auto.master

17. Comment out these two lines:

    • #+dir:/etc/auto.master.d
      #+auto.master

18. Add the following line to the bottom of the file:

    • /- auto.direct --timeout=60 --ghost

19. Save and exit with Ctrl+X, Y, Enter

    • nano -w /etc/auto.direct

20. Enter the following text:

    • /mnt/nfsshare -fstype=nfs4,_netdev,exec,timeo=10,fg                           nfsserver:/mnt/share
      /mnt/smbshare -fstype=cifs,uid=mythtv,user=remoteuser,password=remotepassword ://192.168.1.10/share

21. Save and exit with Ctrl+X, Y, Enter

    • mkdir /mnt/share
      su mythtv
      cd ~
      nano -w .xsession

22. Enter the following text:

    • /usr/bin/xset -dpms s off
      /usr/bin/ratpoison &
      /usr/bin/mythwelcome -O libCECEnabled=0

23. Save and exit with Ctrl+X, Y, Enter

    • nano -w .ratpoisonrc

24. Enter the following text:

    • bind c exec /usr/bin/lxterminal

25. Save and exit with Ctrl+X, Y, Enter

    • mkdir .mythtv
      nano -w .mythtv/config.xml

26. Enter the following text:

    • <Configuration>
        <Database>
          <PingHost>1</PingHost>
          <Host>mythtv.server</Host>
          <UserName>mythtv</UserName>
          <Password>password</Password>
          <DatabaseName>mythconverg</DatabaseName>
          <Port>3306</Port>
        </Database>
        <WakeOnLAN>
          <Enabled>0</Enabled>
        </WakeOnLAN>
      </Configuration>

27. Save and exit with Ctrl+X, Y, Enter
28. Reboot
29. Wait for the MythTV Frontend to start
30. Exit the Frontend (Escape or Left Arrow)
31. Press i
32. Uncheck 'Automatically start mythfrontend'
33. Go to Finish and press Enter
34. Press F11
35. Change 'Command to run Xterm' to:

    • /usr/bin/lxterminal

36. Go to Finish and press Enter
37. Press Enter to start the Frontend
38. Go to Setup and press Enter or Right Arrow
39. Go to Setup Wizard and press Enter or Right Arrow
40. Go to Next and press Enter
41. Change the 'Audio Device' with the arrow keys to:

    • ALSA:default:CARD=ALSA

42. Change the 'Number of Speakers' to: Stereo
43. Next
44. Change the 'Video Playback Profile' to:

    • OpenMAX High Quality

45. Go to 'Test High Definition' to confirm everything works as expected
46. Finish
47. General
48. Remote Control
49. Change 'Enable Network Remote Control Interface' to: On
50. Back
51. AirPlay
52. Enable AirPlay: Off
53. Back
54. Back
55. Save and Exit
56. Appearance
57. Theme/Screen Settings
58. Menu Theme: Media Center Menu Theme
59. Back
60. Localisation
61. Date Format: Sun 8 Jul 2018
62. Short Date Format: Sun 8/7
63. Time Format: 14:10 (the 2nd one for leading zeroes)
64. Back
65. Back
66. Save and Exit
67. Wait for the Frontend to reload
68. Advanced
69. Setup
70. Theme Chooser
71. Mythbuntu 28.21
72. Wait for the Frontend to reload
73. Advanced
74. Setup
75. Audio
76. Use internal volume controls (press Right Arrow)
77. Master mixer volume: 100
78. Back
79. Back
80. Save and Exit
81. TV Settings
82. Playback
83. General Playback
84. Action on playback exit: Save position and exit
85. Back
86. View Recordings
87. Start in group: Off
88. Recording Groups
89. Save current group filter when changed: Off
90. Back
91. Include the 'Watch List' group (press Right Arrow)
92. Start from the Watch List view: On
93. Days to exclude weekly episodes after delete: 0
94. Back
95. Back
96. Seeking
97. Reverse direction in Fast Forward/Rewind: Off
98. Back
99. Back
100. Save and Exit
101. Playback OSD
102. Enable interactive TV: Off
103. Back
104. Save and Exit
105. Back
106. Media Settings
107. Videos Settings
108. General Settings
109. Directories that hold videos:

     • /mnt/share/videos

110. Video Tree remembers last selected position: On
111. Back
112. Save and Exit
113. Metadata Settings
114. Perform metadata update after: Off
115. Display unknown file types: On
116. OK
117. Back
118. Back
119. Back
120. Edit Keys
121. Main Menu
122. Exit Prompt
123. Remove Binding: Escape
124. Exit
125. Bind Key: Escape
126. Conflict OK
127. TV Playback
128. Pause
129. Bind: Media Play
130. Escape
131. Save Changes
132. Back
133. Back (Exit MythFrontend)
134. Press 'M' to open the menu
135. Exit
136. MythWelcome will restart
137. Enter (to start MythFrontend)
138. Watch Videos
139. Press the Menu key
140. Change View
141. Switch to List View
142. Job done!