Question about vanity, hard to explain, just read.?

Okay so when school starts, I don't want to have to do my hair downstairs because it takes a while and our bath room isn't the biggest and its the only one we have, so in the mornings my mom, brother, and me are all in there trying to get ready. So i usually just straighten it or scrunch it. I have a lot of things in my room so I can't but a vanity. I was thinking about getting a storage bin, and putting all my hair things in that, and put things from my desk in it too, and then getting a long mirror to put on the back of my door and just do my hair that way. Do you think that is a good idea? Do you have some other ideas? If so, tell me! haha! Thanks!