I've found soldering/unsoldering to the rotary switch to be easier than the typical Strat/Tele. As someone else mentioned, touch the soldering iron to the back side, not the front. You should be able to do it without using any new solder. And you shouldn't have to touch the iron to the switch board for more than a second. One other thing I do, is use needle nose pliers. When unsoldering, grab the wire you're unsoldering with the pliers and pull with a very slight amount of pressure. Then touch the iron to the other side of the switch board and as soon as the solder heats and melts, the wire will come right out and you can remove the iron. When soldering, hold the wire with the pliers, line up the end of the wire where the hole will be (once the solder melts) and push with a tiny amount of pressure. Touch the iron to the other side and as soon as the solder melts, the wire will be pushed into the hole from the pressure, and you can remove the iron. Much easier and quicker, in my experience, that changing pickups in a Fender.