How To Tap
Here's a great video showing the basic technique, by the excellent Gala Darling.
Know how you tap on a keyboard? Well, tap just like that, or maybe a little harder.
There's no need to really thump yourself. All you're doing by tapping is breaking up any blocked energy at that point of your body.
I typically use two fingers on each point (just so I'm more likely to hit the exact point), and four fingers on top of my head.
Don't worry if you miss any points out, or get them in the wrong order or anything like that. EFT is very forgiving. Just keep going around your body.
Just remember - before you start, measure how much the issue upsets you from 0-10, then tap, then measure again. Keep going until you're at zero.