Step 2: Prep
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.