I use a http://www.miracleironing.com/ that I got at a quilt show because the gal said I would never scorch a shirt again with it, she was correct, I do iron some now. But love it for crafting. I suggest a Teflon sheet (had them in my stamping supplies for embossing anyway) on top of the transfer. Better yet one under the material & one on top of the transfer piece.
I use my regular household iron works fine. Too hot and the transfer material carrier sheet will buckle, just turn iron down. Cut your image in REVERSE - I have forgotten to flip the image a time or two.
I like to do a test piece first out of cardstock for placement and size check.
Check the blog for new project photos, hopefully a you tube video soon.
Here is the table cover I made for my son - cost online $50-100, mom-made cost $11 the material was $2 at the fleamarket, the hat was $1 at walmart clearance shelf, the heat transfer was 1/2 of the $15 box. Cut on my E. Used MTC to vector logo.
Total time: 2 hours from downloading image, vectoring, cutting and ironing. The hat was kinda hard to iron on.