Video guides
Vestureofblood UI interface video on the GT:
JasonWW produced some good guides regarding general NarsilM use. Note that the GT uses a later version of NarsilM, so there are some minor differences:
Narsil Part 1 - Ramping and Features
https://www.youtu.be/dVX6BGQpHr8
Narsil Part 2 - Strobes and Blinkies in Ramping
https://www.youtu.be/rdwah7HJAJA
Narsil Part 3 - Turn On and LVP in Ramping
https://www.youtu.be/w_6AXcQecSU
Narsil Part 4 - Using Mode Sets
https://www.youtu.be/mbUFPpJxvYk
NarsilM Part 5 - Mode Sets Strobes and Special Features
https://www.youtu.be/uzaAsH1i-d0
and GT-specific: BLF GT with NarsilM v1.2 - new strobe modes
https://www.youtu.be/3D2mGwIf854
How to Change Menu Settings in NarsilM (Q8)