How difficult is it to ride a sport motorcycle?

I'm about 125lbs at 5'9"and I'm looking into getting a sport motorcycle, something like a Suzuki bandit or what not, probably 600cc. I'm curious though, how hard is it to handle a bike like this, are they extremely heavy, do they have decent balance when still? I just don't want to get to a training class and find out the bike is a bit too much. They don't seem like they would be but I've never had a chance to toy around with one and get a feel for the weight.Any info would be helpful! Thanks.

Since you are so light, I would suggest starting with a 250cc. Dont let the dealers fool you into getting a 600cc. Those things are really fast and can top out at around 170mph. Stick with a ninja 250 or a buell, those are nice, its still pretty quick, but you wont kill yourself on it, plus you will save a good couple grand.