Everyone is a little concerned with making their first cut Erik. I think a lot, if not most, of us went into it a bit like you're describing. If you really take your time and research each part, you will do fine.
When I built my kit, I studied this forum. Searched for one bit at a time (biceps, then forearms, then shins, etc). Opened 10 or more windows from my search to see how others had put that same armor together. It will be time consuming, but it's fun and the pay off is awesome when you get approved.