The thing is you need to be daring. There is always a first time and you'll only learn when you make mistakes. Trust me, there's always enough mistakes to make
Anyway, what you could do is watch how it is done when you're at the LHS. This way, it can give you enough confidence to take the first bold step.
The RB website in the FAQ section has some pretty good steps and pictures of what to do and not to do and tools that you need.
Most people on their first try would probably bungle up the first step (which would scare them away) by stripping the heatsink / button head screws. You need correct tools to be able to take these out without stripping the head. What I usually do is to change them all the screws to allen type. Easier to work on and to tighten / open them with confidence when you need to. No more stripping of screw heads for me
If you're already gone beyond that, then good. You need to work on a clean place with no dust particles flying around. If possible, do your engine maintenance on a piece of white clean cloth. That way if you drop any small part, you can find them easy. Good luck