Changing gas tanks for new ones: Any helpful hints?

[lolife99]

I recently purchased an '86 short fleetside truck. I guess I got a little sentimental because it's the exact twin to one I bought new in 1986. Anyway this thing need some work! Both gas tanks are leaking. Both frame supports are rusted away to nothing. I think the plastic tank covers were the only thing holding them on the truck. Long story short. Does anyone have any tips on making the swap to new ones any easier. I've never done this before and I'm going to have to do it again on my crew cab. Any help would be appreciated. Thanks, lolife99.