No, hypnosis is not mind-control, and it can’t be used to force you to do anything you don’t want to do. In fact, it won’t work well for you unless you are motivated—so if you are looking to, for example, quit smoking because your partner wants you to quit, hypnosis would not be your best option—you have to want to make the change yourself.
The answer depends on how deeply hypnotized you are. In lighter hypnotic states you will be aware of a lot of what happens, maybe everything or maybe only parts. When you get into a very deep hypnotic state, you may not remember anything. It is important to note that both light and deep hypnotic states are quite effective. One is not better than the other. Whatever level of hypnosis you reach will be the right one for you at that time.
If you are wondering about all those people who do silly things when they’re hypnotized onstage, remember that people who volunteer for these shows are usually doing it for fun and they are open to some degree of silliness. If the hypnotist tried to make someone do anything they truly didn’t want to, the person wouldn’t do it.
No, you can not. You have to cooperate with the process of relaxation and open to it. If you resist, you can’t be hypnotized.
Most people can be hypnotized. Those who are on heavy narcotics, have suffered physical damage to the brain, or suffer from psychosis may find it difficult to reach a hypnotic state.