Use a miter saw: Set to 45° for standard corners. Coping method: For tight inside corners, cut one piece straight and "cope" the mating piece. Test cuts: Always check fit before nailing.

Home improvement stores: Home Depot, Lowe’s (pre-primed options). Lumberyards: For custom wood profiles. Online: Etsy, eBay (for vintage millwork).

Use a pry bar with a thin putty knife to protect drywall. Cut caulk/paint seams with a utility knife first. Pull nails out from the back to avoid splintering.