From my research, I have estimated $15-$25k for an entire system, about $7k for tree clearing, and $2-3k for engineering diagram for the new system.

@Sherry McQuageThe best times to plant a tree: 20 years ago and today.I was asleep in 2009, I’m awake in 2020 COVID time making moves.

It cuts way down on weeds, which really cuts down on caretaking. 2. look for drought tolerant perennials. this plants require little maintenance a come back year after year. some plants i use- Gardenias- lantana- knockout roses- liriope - evergreen trees and shrubs, such as leyland cypruss. 

The first wooded property, that I bought, I introduced myself to the neighbor, who told me he was timbering his property and that there were timber quality trees on my property also. 

By overgrown, do you mean trees and shrubs or just weeds?

Their a book,  "The New Psycho-cybernetics" by Maxwell Maltz will help you feel better and get rid of the frustrations.Making long term plans for your real estate career will help you get from among the trees to see the forest.  

However the first home of any kind I ever knew was constructed of bushes, dried tree branches, card board boxes, and everything tied together with shipping string, had dirt floors, no plumbing, no electricity, and not water.

They will be burning their furniture and part of their house to stay warm and eating their trees and old shoes.

the end result is not the same, it is a tree of end results, one of the branches being a tenant dead and the other branches are ok.

Most of the homes in the area don't have larger proper lawns, but rather have a mix of tree and bushes with either planted grass or more often natural ground cover.