Ok, I have a pretty decent lawn right now. But next year in the spring, I really wanna jump on it and get some fescue grass established. Problem is, I don't know what to do first. Should I try and get rid of the bermuda grass & others out of the ground, or is this unnecessary? what are the best products for this type of 'project?' I've read plenty on weed-and-feed products, just not sure what kind is best. Thanks for your time.