So first, you must be at least 3/4ths the height of your assailant. This can be achieved by standing on a chair, in the case that your assailant is a 7 foot colossus with mommy milkers.

Secondly, you have to determine if you are alright with being beat to death by a chair. Most of the time, you will be looking to your assailant to determine that. For example, if your assailant is a beta male, then allowing him to beat you with a chair would turn you into his little ♥♥♥♥♥ boy. As such, you should not consent to him beating you with a chair. However, if your assailant is a 7 foot colossus with mommy milkers that is unable to express anything but spite, then clearly this would be the best thing that has ever happened to you. Therefore, you should consent to being beat to death by a chair.

Once you have determined this, you can move on to the next section.

So once you have determined that you must defend yourself, you should take a look at this diagram.
According to this diagram, you should wait for your assailant to pick up the chair before acting. This gives you an optimal amount of time to respond. Acting too soon could lead to certain death, but acting too late will only hurt your assailants feelings.

Next, when they lift the chair, you must support them in every way. Chairs are quite heavy you know. So make sure your assailant doesn't hurt themselves by dropping the chair on their beautiful face.

Finally, you must give them a hug. Once they have received love and attention, of which their lives have been sorely lacking, they will realize the error of their ways, and put the chair down. It is quite a beautiful thing to witness.

All of these steps do not apply if you are fighting a 7 foot colossus with mommy milkers, even if the part about love and attention applies to her. You are a ♥♥♥♥♥ if you do not want to be beaten to death by a 7 foot colossus with mommy milkers with a chair.