From what I've heard the Yukon's and Tahoe's are the same for this mod... I removed the bolts that are holding the housing in place on top, and also removed the grille's center mounting bolts(to allow for additional room when removing the housings). I then removed the inner fenderwell front bolts and/or fasteners to allow access to the headlight housing's lower bolt. Once these were all out the housing was carefully removed using care to prevent chipping the paint. Mine have to be popped out of their snapped in, seated position. Once this is taken care of I can remove the housing by rotating it in a circular motion from the inner lower corner outward (clockwise on driver side, counter-clockwise on passenger side).
Personally, I left the lower bolt out to facilitate future removals... eliminating this step.