This is called a miter joint. The easiest way to cut taller baseboard miter joints is with a compound miter saw which allows you lay the baseboards flat to adjust the bevel angle.

"So first thing we're going to do is put our initial 45 degree cut into this baseboard at the length we need," Weeks said pointing at a miter box.

3. Cut your baseboards to size This is probably the trickiest part of installing baseboards, particularly if you are working with lots of corners.