As long as you have some calm days to fly on, the low power ratio isn't a big deal. You just can't horse it through wind or get instant stall recovery without more juice up front. I'll suggest a different route for your first experience though. Go to this address and find a club that does training.

http://www.modelaircraft.org/clubsearch.aspx

Many clubs keep a couple of training planes on hand for beginners to use, so your first few flights could be with an instructor on proven equipment. If you decide that you like the hobby, you'll already have a rapport with some experienced flyers who will do an inspection on your plane and help you with flight trimming and setup.