It's unanimous: parking at OU sucks! Students agree that having a car on campus the first two years isn't worth the hassle. Even when you live off campus and have a parking space for your car, simply driving uptown to mail something or running to drop off a paper can be a nightmare if you have a car, due to the lack of parking spaces. Not to mention, every decent space is metered, so don't even think about leaving home without some quarters because you will either get a ticket or get towed (and pay over $100 to get your car back).
Basically, you really don't need a car your first two years, so leave it at home. Luckily, the campus is so small that it's really not that necessary, and because you'll have a meal plan, you don't need it to go grocery shopping. Once you move off campus, look for places that have parking available. Inevitably, most students get ticketed and/or towed at least once during their time at OU, partly because every campus building lot is reserved for faculty or commuters (you can't even park at Ping until after 3 p.m., which is ridiculous and makes it almost impossible to squeeze in a workout between classes, unless your classes are close). If you come to OU, just be prepared to endure the hell that is Athens parking-definitely the worst part of student life.