A PF swap is a lot of work, but with some planning and a lot of pictures, AFM isn't too bad. Having another playfield ready makes it a little easier because then you aren't shipping the old one off and waiting months for it to come back. Things will be a little fresher in your mind.
Also, by this time, Williams/Bally had things pretty nailed down and the WPC-95 machines are fairly easy to disassemble and reassemble. For the most part, all switches, targets, flashers, and assemblies unplug and can be removed without unsoldering wires or removing switches or flashers. You do have to unsolder coils, and pop bumpers are a pain to remove and reassemble.
One thing to keep track of is which under-playfield screws go where. They are different lengths based on what they are holding. You don't want to attach a stand up target with too long of a screw and push it up through your nice new playfield.
Of course you do have to remove all the playfield connectors from the power driver board and the switch connectors from the CPU. But if you take pictures and label stuff, it goes back together pretty easily. There are also a lot of photos of AFM teardowns out on the web, and that is helpful.
I didn't mean for this to turn into a mini PF swap tutorial. I guess I got carried away.