If you use tweezers, you need to grasp the tick close to the skin to avoid squeezing the tick and causing it to inject more of its poison into your bloodstream. Here’s a YouTube video that shows you how to remove them.
However, there is an argument that tweezing the tick off is the worst way to remove a tick and that you should get yourself a spray to freeze warts (Wart off or similar) from the chemist. Here is a video from the Catalyst program showing how to remove a tick.
We usually just grab the tweezers, but freezing them off does make a lot of sense and avoid squeezing poison into your system. We (apparently) don’t have ticks that carry Lyme disease where I live, but if you’re in the US, then it’s even more important to get it off without injecting their poison into you.