Thanks for the advice Jeff. However, you didn't answer the question about being in over my head.
As for the pond and the spring keeps the level fairly constant. They also have a couple downspout drains that empty into it, but that doesn't really affect the level much. They dug it closer to the house, bermed\dammed it up, but left a spillway that leads to a ditch that leads to a fairly large lake.
I'm far from a water expert, but it has worked for them for 9 years, the way they have it now, they just want to be able to enjoy the pond\view\fountain from their house more, and the main option is enlarging it because of the distance from the house. I'm going to meet with my excavator sub to see what he thinks about enlarging it, probably end up using his crane with thumb for rock placement due to rock size and reach.