Well, I'm 20 years older than you and at 33 knowing what I know now, I would do it in a heartbeat. However, firstly, don't think that the hours will improve, they won't, at least for the first few years. Secondly, perhaps the best piece of advice I can offer is no matter how simple the business is, do your due diligence and put together a business plan. Third and perhaps the best piece of advice I can give is take Big Cliff up on his offer and spend a few hours or days with him and absorb it all.
You are at an age where you can recover from failure. Don't get to an age where you can't recover from regret.
J...