DO NOT STAPLE INTO YOUR SHINGLES. EVER. IT TAKES A VERY TINY H OLE TO ALLOW WATER INTO YOUR ROOF PEOPLE.
to hang lights onto the gutter when gaurds are attached, take small S hooks and slip over the top and hang lights onto them, or get a box of big paper clips and bend your own hooks... the paper clips are flexible enough to wrap around the l;ight strands and hold them in place.