It's not bad if you have a good plan, correct tools, and all the parts already.
If you can weld it's much easier.
I made a cross member for the front out of 3x6 rectange tube with .25" wall. I knotched it so it'd sit in the frame rails and then welded that in, and hangers to that. Some hangers in the rear, shackle one side or the other, u bolt that biotch in, run shocks and brake lines, mount a gear box some where, fab a column, run steering linkage, build a drive shaft, and you're good to go. With leafs that is. Which is what i did.
Check out project mooseknuckle in the build threads. Not much good info, but there's some. And some pretty pictures.