Dom lights. 7 minutes.
https://www.youtube.com/watch?v=PK1_uuliYTQ
DIY. Dom lights. 17 minutes.
https://www.youtube.com/watch?v=jGbRbYt_fZM
How to measure your roof for LED tracks.
https://www.youtube.com/watch?v=bPbHGLS30bc
Installation video from Evenlights. 14 min They also sell the DIY kits.
https://www.youtube.com/watch?v=VN3NSfZw4fs