If the trim is painted, then you can just paint it over. If the trim is stained, then you will need to strip the old finish and stain it again. First, use a putty knife to remove any loose paint or plaster. Then, use a wire brush to remove any remaining paint or plaster. If the trim is stained, then use a degreaser to remove any grease or dirt. Next, sand the trim with 120-grit sandpaper until it's smooth. Then, wipe it down with a damp cloth to remove any dust. Finally, apply a coat of primer and two coats of paint or stain.

If your wood trim is damaged, you can try to repair it yourself using a few simple tools and supplies. Here's a quick guide on how to do it: 1. Remove the trim piece from the wall or object that it is attached to. 2. Use a chisel and hammer to remove any old or loose paint or putty from the trim piece. 3. Sand the trim piece down until it is smooth. 4. Apply wood glue to the back of the trim piece. 5. Attach the trim piece back to its original location using nails or screws. 6. Wait for the glue to dry before painting or sealing the trim piece with a sealant of your choice.