I made one of these holiday stars. The challenging part is how much to cut and fold and how much to overlap the underside “flaps” to result in a flat underside (which is necessary to glue two stars together back to back). I have a couple of tips that will make things easier.

With a 8 1/2″ x 8 1/2″ square (using 8 1/2″ x 11″ paper), the dimensions of the cuts and folds and overlaps are as follows:


Additionally, the shape of the stars makes it applying pressure while the glue dries quite problematic. I used “clamps” to hold the stars together: a string of rubber bands with ends hooked together with a safety pin: