Richard and I put together our water garden ourselves, after much consideration of whether we could do it. Of course, getting prices from professionals gave us a pretty good idea we would have to do it ourselves or not at all. We drew our plan, had a big hole dug, got the flexible liner, skimmer box, water fall, plumbing things, some water plants ( water lilies, pickerel weed, acoris, etc.) We ordered a ton of stones and put them around the edges.
We love to sit on our deck listening to the sound of the water fall and watching the dragon flies, fish, flowers on the water lilies and anything else. There is a lot of life in a pond. We had two frog visitors but they only stayed a few days.