6. GET THAT SOLDERING IRON OUT, AND PREPARE TO DO THE SWITCH!
Make sure your soldering iron is heated; plug it in and let it sit for about 5-10 mins. DON'T TOUCH THE DAMN THING TO SEE IF IT'S HOT, FARM BOY! Either splash a little water on it and see if it sizzles, or, better yet, hold it to a piece of solder over some scrap wood or cardboard. If the solder melts, you're good to go.
Look at where the wires from the pickup that is in the guitar now are soldered to, and choose one, then desolder it by putting the tip of the soldering iron to to point where it's soldered onto the jack/pot/switch. make sure you're doing the correct pickup.
Tug on the wire from the pickup you're removing to make sure it's actually the right one.
Use the needlenose pliers to move pull the wire out of the liquified solder. If you have a desoldering bulb, now's the time to suck up the excess solder. If not, then take the same colored wire
from the new pickup and solder it to the same place the old one was. If the place you're supposed to solder it to has a little hole in it, then loop it through there. Put the solder up to that point and then touch it with the soldering iron to get a little bit of solder on there to secure it down.
Do this to each position.
7. TAKE THE OLD PICKUP OUT, PLUG YOUR GUITAR INTO YOUR AMP, TURN IT UP HIGH, TAKE THE PICKUP YOU JUST SOLDERED IN (the one you're putting in) AND TOUCH THE SCREWS/MAGNETS WITH A SCREWDRIVER.
If you hear a popping noise coming out of the amp every time you tap one of the screws or little metal dots (called "pole pieces") on the top of the pickup, then you've successfully soldered in the new pickup.