I want to install a 2 1/2" to 3" lift on my 81 3/4 ton. I've never done this so I want to know if it can be done under the old shade tree in the back yard. I plan on going with new front and rear springs. The guy at the local 4x4 shop wants $1200 to do this. That sounds like way to much to me. How hard is this job?