Summer's tip for safely trimming wiggly kids' hair:
I cut my 2 year-old son's hair with blunt edged (but very sharp) nose hair trimming scissors. He wiggles and turns his head a great deal while I cut, but the rounded tips on the scissor blades keep him safe from pokes. I also make sure to always have my fingers between the scissors and his head. So far he has come through several home haircuts unscathed.