I was contacted by a person to landscape their newly built home on a lake. When I got there and talked to the owner, I could see that she wanted alot of masonry work. Cobble stone driveway, 2 levels of retaining walls, flagstone walkways and patio, stone firepit. I have done some smaller stone work by myself, but not this much. She also needs planting and landscaping, with some topsoil and seeding to finish the whole yard. My question is should I sub the stone work out to a mason, and do the rest myself? The masons that help me out occasionally are very busy right now and can't commit themselves for this much work. Also, what should I charge % wise over the masons bid? I would guess there is roughly $10,000 - $12,000 worth of work in stone alone. Any comments would be appreciated.