Trust me it's easy. The only problem I have had, and I have done 2 tank swaps, was getting the fuel out of the tank. If you have a way to suck the gas out, then all you have to do is remove a few hoses and bolts. Swapping the gas cap and fuel pump assembly is easy, only a few bolts, that's it. I think there is one electrical connection (for the low fuel warning light), it is made to disconnect so it is simple pull out, plug back in.
Like I said, it is really easy, don't worry about not having a shop manual.