How can I suck dick without hurting him with my teeth?

My teeth are pretty bad. I'm actually wanting to get braces soon but I still have to figure out the insurance first. Anyways my boyfriend wants me to give him a blowjob. I never done it before but I want to try. The problem is that because of how my teeth are lined up I don't have much space. Plus he's like above average in size and I'm scared my teeth are gonna hurt him. Should I just wait till after my teeth are fixed?