A clawfoot should be taken out by some local reusables fella - they're worth a bit. A steel tub comes out either by removing the drywall around it, or by cutting the bugger in half with a sawzall with a metal cutting blade in it. This is a two-man procedure - one cuts, and the other sprays WD40 at the blade. See if you can beat 3 minutes 44 seconds! Same goes on the no-doubt totally frozen drain on the tub - cut it with the sawzall and then it'll spin like magic.
Tubs are kind of a drag, but usually getting them in and out of the building is far easier than squeazing a 59 3/4 inch tub into a 60 inch spot diagonally... stupid pythagorean theorem!
If you are going to a stand up shower from a tub, then you have drywall and flooring repairs to do, as well as re plumbing.