I suspect the rust issue on steel frames is a little exaggerated, but I did buy a can of frame saver and I want to use it without the hassle of taking apart the whole bike or paying someone to do it. Here's my idea:

Take out the seat post. Do the top tube, seat tube, and seat stays from here.
Remove the bottle cage and do the down tube from the holes there.
Remove the rear wheel. There are little welding holes on the chain stays near the dropouts. Do the chain stays through these holes with the seat post removed to allow the propellant to escape.
Remove the bolts from the fender mounts on the middle of the fork blades. Do the forks from here. -Could this mess up the bearings in the headset?

Does that sound like it will work? Also, will the frame saver make it more difficult to put in or remove the seat post?