Tuzz
Very slowly and be sure to take deep breaths when possible. It is very tough to build anything after your pond is full, The main thing to keep on your mind is how bad do I want this struture? Once you get the deep part completed it becomes much easier. We use 80 # bags and we have gone thru 70 bags and if you are in doubt ask my back. My lady said to start buying 40 # bags but they cost more.
