"switch pins" means to take the wire off of one pin and put it on another. this is all done at the harness. you do not have to take the ECU apart.
the MPFI swap can be really easy, or really hard depending on you. Just take your time slowly and make sure that you solder and shrink tube all connections. You dont want to get your swap all together only to find out that you didint solder one wire and now your car dont run
as for pics or diagrams, do a search and you should be able to come up with something.