The only fuel tank I've every removed and installed that was easier than this AD Chevy is the first generation Mustang.
You'll have that tank installed in no time. Did you buy new straps?
You can purchase pre-bent fuel lines from a variety of sources. You'll need to purchase a new petcock for the bottom of the tank, too. In stock configuration, all the new parts will bolt right it and fit without any fuss.
I got my tank, petcock, and tank-to-pump fuel line from NPD.
What's your fuel pump situation? Don't buy a new one if you have an original. Have it rebuilt.
Post a photo of it.