Welcome, where did you find a four foot bus?
I doubt you'll really need to "hire out" if you just take your time and do plenty of research.
You yourself can do it. I "hire" friends for the things I don't know and I look on while they're helping. You'll learn new skills and make new friends as you go.
You will learn who your real friends are when you have a bus project going.
Real friends show up, really good ones show up with beer!