Step 2: Prep

Picture of Prep
Before you start any work you need to make sure you don't get electrocuted. If the wall you are removing doesn't have any outlets or wiring (Isolated or stub wall with no outlets or switches) then you can skip this paragraph. If, once started you find wiring come back to this paragraph and follow it. Eventually you are going to shut off the power to the wall at the breaker but before you do it is a good idea to label all the switches. Once everything is labeled then shut off the breakers in the work area. Make sure to test all switches and outlets so you don't get any surprises. With the power off remove the wall plates and then remove the switches and outlets from their boxes, or remove the entire box if it is attached to the wall and not a stud.

Take anything hanging or attached to the wall off. Remove screws, nails, etc. Pull everything sitting next to the wall, away.
Use a pry bar to remove the baseboards and trim. You don't care about damaging the wall but, if you plan on reusing any of the trim, use caution.

With the wall now bare, lay out drop cloths around the perimeter of the wall and cover everything you can in any adjoining rooms, drywall dust is the worst.

Before moving on have a little fun. Grab a permanent marker and go to town. Hit it with your hammer a couple of times (watch for studs). OK enough fun, back to work.