I need to trim a customers 60' long hedge that is maybe 2-1/2' wide and 4' tall but never trimmed in the past. I am trying to determine best way to get a straight level top and sides. I am thinking using stakes at each end of the hedge and run a string line on each side of the hedge length wise attached to the stakes. Then cut above the string lines to get a straight level top for the hedges. Basically do the same type of setup to cut the sides. You got any other ideas.