Yeah, what they said...but especially the PB Blaster or WD40. I just put a lift in my '90 YJ (also from NY), and forgot to soak one nut. It was a very obvious difference, re-injured a shoulder because of it.
The upper bolts around the gas tank will be difficult, but as NY94YJ stated they will come out (won't look like it though).
Clean the threads with a wire brush (bench top if you have it) before reassembly...lot easier to get the nuts started.