i didn't cut my lower valance either for the ssmax 1.5BL, it's just pulled down a little i chose the 1.5BL over the 3" as i wanted as little frame showing as possible, i just needed a small boost to clear my 35's, still no future plans of going with a 3" body lift.. just shows to much body for my liking.
as others have said the 1.5BL is quite easy, i am terrible mechanically and still pulled it off, just had a buddy give me a hand on the rear end to pickup / align the truck bed on the blocks... no cutting of fan shrouds, no need to worry about running boards to cover the frame got it done in 2.5/3 hrs or so.