I've opened skins with oil, but I prefer flour. The advantage of oil is that you don't end up with raw flour on the skin. I find oil harder to work with, but give it a try - you may like it.
You don't need to toss to open a skin - just check the first video for the technique that I use. However, learning how to toss is not that difficult. The key is to make a few experimental doughs that you don't plan on turning into pizza. Then you can practice and not worry if it ends up on the floor, or on a lamp, or on your cat...