I found a buddy to cut them for me. So one of my friends said there's a special way to put them in and its really difficult. Doesn't seem that hard? Cut 2 by 4 so its a 2 by w/e I need let's say 3 and a quarter. Cut it to 15 inches height. The just cut those sides at a 45* angle on both side. Apply glue and push into place then screw in after glue dries then apply caulk. Right? Not that hard? Or is the small space that will be behind the 2 by 4 between it and the wall bad? Should I fill that with caulk?