How do you stop your hockey stick vibrating when you hit it?

Warm it up properly. That means at least five minutes doing light passes or juggling and jinking with a ball, then some sweeps and hits.

The most important thing that you should definitely do is hold the stick quite tight in your hand so that the vibrations are absorbed by your arms and body. The loser you hold a hockey stick the more it will vibrate within your hand thus possibly causing some discomfort when hitting.