Be careful with Audacity's free download. I used it to mix an entire routine(several hours of work)but when I finished and burned it, I was shocked to hear the Audacity "promo" voice over, claiming that I was using a demo of Audacity and if I wanted to learn more blah blah blah...
I couldn't get rid of it. Audacity really isn't that expensive and it is easy to use once you get the hang of it. If you have the time and patience, go for it. I do school cheer as well and completely understand the financial limitations (a lot comes from my own pocket) but honestly, it is so much easier and faster to find someone who knows what they are doing. Good luck!Cheers!