What to do with over grown land?

My husband and I are quite possibly buying a home. We meet with the owner tomorrow. One issue we have is the land it’s on is overgrown. There are at least 6 trees in random places throughout yard, there is minimum 10 shrubs/bushes at the side on the house and weeds everywhere. The trailer house is built on a slanted land somewhat. If we just rip up every plant shrub and bush will we cause foundation issues?
We do not have the money for a professional and it’s our responsibility to change yard if we buy it.