Check the size of your 1/2-in. plywood backing board. Then, cut the fiberglass window screen to be eight inches larger than it in both directions (so there are four inches of overhang on each side).

It can be scary to drill holes in the wall. For the first entry in our new D.I.Y. series, we’ll show you how to mount a television, or whatever you want. By Tim Heffernan Photographs by Clark Hodgin ...