Well, if you're gonna bite the bullet and have someone else do the work, at the very least you oughta be there to learn. And to understand what they are doing and why. Why? It's a safety issue. Unless you know what's there if something goes wonky in the future you'll be just as (pardon me) ignorant then as you are now.
In addition to the helpful hints of sources given earlier, try this Electrical 101 Topic with a lot of good links:
Electrical Systems 101
Here's some more 101 Topics
"101" Series - Quick Links to "Popular" Topics
Remember, none of us "knew this stuff" before we bought our boats, we LEARNED how, each of us on our own time.
Read, read, read, and poke around.
Good luck. You have a great boat.