Is an LSAT prep class worth it?

They're pretty expensive, but I'm scared that I can't prepare all by myself, and thats assuming I can motivate myself to study 50+ hours on my own. And I know thats not a good start to my law career. But I feel having a class that I'm paying alot for, will motivate me to study regularly.

I found a live online class, with Princeton Review. I like it because it will keep me working and studying up until November with 55 hours of studytime, and hopefully get me ready for the December LSAT. But I guess I'm just wondering if its worth it, especially if its online.