I mostly ride in the city and this is the best upgrade so far, it's really quiet!
Couldn't find a good tutorial for belt transition so I made a video of the process.

(Don't forget to tighten the balance screws at the end, you can see I forgot to tighten them on last frame.)

I bought the belt kit on Luna Cycles shop in US. I would say its 123 hour work, depending on a skill level and luck :) but I guess it will be easy for you when you see this video.