It gets easier as you do them. Go with stuff you're comfortable doing first then branch out and try something new.

The hardest part of a new journey is always the first step.

I agree with that sentiment, you just have to jump in. I've been nervous about a lot of shops, but as long as you're prepared/have read all instructions I've found it usually goes well. Sometimes something unexpected happens, but you can't know that in advance and just need to think on your feet.