|This tip is from a '96 issue of Threads magazine, and helps form terrific pockets around templates without burned fingers. The above link is to the author's video at the Threads web site.
Basically, the idea is to use a template cut from tagboard (file folder paper) cut in the finished shape/size of your pocket. When your pocket has been cut and the top hemmed, place a piece of white tissue paper or thin pressing cloth on a surface you can iron on, place the pocket face down, and center the template over it. I found it easiest to work on my ironing board and use push pins through all layers to stabilize everything.
Lift up the tissue/presscloth, firmly pulling the pocket seam allowances around the template, and press around the edges. You can keep your fingers out of the way of the hot iron, and get great, crisp edges around curves or square corners.