I rode with a guy last year that rode it fixed. He's a strong rider, but I don't recall him having a super tough time. If it's the only bike you have, I say do it. The worst that could happen is that you attempt something great, and you fail. Still better than not making the attempt right?
Get training for it, and you'll be fine. Just be sure to include some modest hills in your training so that you're prepared.
Steve