Drywall hanging and drywall finishing is an item you probably do not want to do yourself if you can help it. But we're here to learn to do things for our self, right?
The quality of the hanging work, determines the difficulty and quality of the finish work.
You may want to try to find a sub-contractor in the area and trade for the complete job, not different people for supplies, hanging & finishing. Get someone that is responsible for it all. If you don't, you are asking for problems, because anything that comes up will be someone else's responsibility, and you will end up paying more.
If you do hire it out, hold back 10% of the total price until after the first coat of wall primer paint is on. This allows you to see imperfections better and the finisher will return and touch up the work.
Drywall is cheap. And the materials to finish it are also cheap. So if you do it yourself, it will not be an expensive learning project in materials, just your time.
First we will cover the drywall tools you will need.