Welcome to Geekhack!
The making of keycaps is by no means difficult, as long as you have the right equipment, and a fair bit of patience. Expect your first few batches to fail - that is perfectly normal. There are many threads in the making stuff together section that infiniti has directed you to from other members who have tried their hand at keycap making, and many of them have turned out some fantastic results!
Btw have you got a mechanical keyboards yet?