Changing the tubes was one of the first lessons I got after I bought my bikes. If your LBS offers a Bike 101 repair class, I'd recommend it. The shop I bought my bikes from had one and I learned alot!!! Changing the tubes gets easier! If you have a mountain bike, it's probably going to be easier than the road bike. Definitely invest in some tire levers... I carry 2 per bike and 3 in my camelback. It will get easier! Don't give up!!!