I really don't think your chances of screwing up are "really large", or even moderately large. B&W processing is easy; just follow all the steps, and make sure your chemicals are fresh. But why not shoot a couple of rolls now that you're back home and practice with those? You don't even have to wait till school starts- all the equipment you need to develop 35mm film (not counting chemicals, which you'd have to buy anyway) can be bought for around $75. You can load the tank in a changing bag, then the rest of the work is done in the light.(posted 9120 days ago)I say go for it! If you're still not feeling confident, then you can send your important stuff out.
"Think you can, or think you can't. Either way, you'll be right"- Henry Ford