There are some video's on how to due this. Go to the site Kamsnaps
Heat up a thickish needle in a gas flame and press it gently into the middle. It will melt through and come apart. (It is a good idea to hold it in tweezers and not your fingers.) Or use a soldering iron - but you will probably have to search someone's workshop to find one!
I also used the hot fix applicator. It worked quickly for me, just don't burn the fabric. Wonder why I know that. lol