To learn the foiling hair technique you can watch a video on YouTube or find step by step directions on the internet. For best results, however, you should take a class where you can practice on a model first.
The first thing I would do is look up what I need to have. Once I have all the items I would then read step by step instructions. Once I feel that I have understood what I have read I would then watch about 10 videos. The different ways that people go about foiling their hair.