Time is not wasted if you learn from your mistakes. If you're near a LQS or a member of a guild, ask for help. It's amazing how much people will help you if you simply ask politely and say thank you.
In my experience, puckers, front or back of the quilt, are always a sandwich tension issue. Either the sandwich is too tight or too loose. I've never sandwiched on the floor so can't comment on how well that works or how to improve the technique. Heck, if I got down on the floor, I'd never be able to get up.
Neesie's idea is a good one. But if you can't bring yourself to do that, sew it all around and donate it to a charity or animal shelter.