This is my first post here so I hope I make this clear enough. I attempted to install a new garburator and found that the fittings under my kitchen sink are seized and it seems as though they are glued together. Is there some way to unstick the fittings without sawing through them and purchasing all new fittings? Please advise. Thank you. P.S. I haven't the slightest clue about plumbing and I only purchased this garuburator because the box said it would be simple to install. OOPS!