This is just a general question, but I never used iron-on patches before. Has anyone used them? Are they reliable or will I have to sew it on? I'm asking this because I want to personalize my bookbag with an Australian flag, but I'm afraid it'll come off. Plus add to the fact that I'm a piss-poor sewer, it doesn't really help matters.

If you used them, how exactly do you use it? Do you place the patch over the area you want it placed and iron over top of it or iron the reverse side and quickly adhere it to the fabric?