My tried and true method is.......grab, open, shove, and shut.

I cram the kitty between me and the arm of a chair. With my left hand I use middle finger and thumb over the top of the mouth. With the pill between my thumb and second finger of my right hand, I use my right hand third finger to push down on the lower jaw. I then literally shove the pill as far back as I can and quickly close.

Good luck.