Here are the steps to cut outside corner trim:

1. Measure the corner trim size needed.
2. Make marks on the corner trim wood.
3. Make the wood piece placed on the miter saw table.
4. Turn the saw blade on 45 degrees outward.
5. Measure the other piece and side of the wood.
6. Cut off as before.

You can use a miter saw to cut the trim at a 45-degree angle . This is the most accurate way to get a clean, symmetrical cut. If you don’t have a miter saw, you can use a hand saw or chop saw to make the cuts. Just be sure to measure and mark the angles carefully before cutting.