Locate the studs in the wall using a stud finder. Whether you remove the wall completely or just make an opening for a door or window, you may need to leave the studs in place so they continue to support the weight of your home.
Mark the location of the studs using tape.
Consult with a professional contractor or structural engineer to learn how to best shift the load. The professional may advise adding a support beam, which may be as simple as placing a two-by-four between studs to preserve the integrity of the wall. Some part of the load-bearing wall must remain in place, even if it is reduced to beams, to prevent sagging and collapse in the future.
Demolish the areas of the wall that will be removed with a sledgehammer and the supervision of a professional contractor. Brace supports may be wedged into place to support the ceiling as you work.
Place new studs and supports using two-by-fours, 4-by-4 posts or whatever is recommended by the professional.
Apply drywall boards around the wooden studs and beams to make them look like walls again.
Prime and paint the walls to finish the project.