Tools

For hairdressing, you have the basic kit to start off with. The kit costs about $6000-$9000, depending on what brand of hair tools you get. The two things you will need the most in hairdressing is scissors and a comb/brush. Although you will use a blow dryer and straightener or curling iron on a client, some will prefer to leave the hair salon with their hair air-drying naturally. Consider the fact that the majority of the time, people will just want to come into the salon to get a trim, or a big chop, or also dye their hair. To be able to cut hair, you'll need scissors and a comb. Without these, you wont be able to cut hair at all.
To learn how to cut hair, you should be taught the proper way. Depending on how long the hair is, how thick it is, and how damaged it is, plays a big role in cutting hair. Some say you should cut your hair dry, because when you cut it wet it's shorter when its dry. But cutting hair wet is also easier to handle, and more precise.

It's not the end of your dreams when you wake up in the morning

Alot of people think hairdressing is an easy task. In reality, you do have to go to school for it if you want to be properly trained. And you have to graduate to get into university for this course.
You don't particularly need great marks to get into hairdressing. C+ average is the lowest to get in, but what's the point in not trying in school. Good grades and enthusiasm can get you into alot of open doors.
Also it depends where you live, if you don't have a school offering any hairdressing classes, you might have a hard time managing this. So it's good to do your re-search when wanting to do this field of work.
If your really determined and dream to do this job, try shadowing at a local hair parlor to get a sense of what a day in the life is. You might end up actually hating it. So it's always a good idea to shadow, and it's also good to get some knowledge of it, so you wont have to stress about it when you get into the program.
Hairdressing is an art. Why? It's a form of creativity and personality. So don't worry what other people think of you, or what your wearing. They expect you to be unique and totally out of the world 'hipster'. Plus, it will really bright up your self-esteem.
Once you have completed the requirements, then you will have your chance to go into school for two years or more depending on the school to get your license to become a hairdresser. Then you are free and have the whole world to work around.