I've been taught this by a veterinarian that was also selling a product that would help you do that and I've been inquiring about really interested in buying it, and she said I don't need it and it's a waste of my money, so I trusted her and I can confirm her instructions work surprisingly well.

What you do is find those tweezers (a.k.a. eyelash pliers) and put the pill at its end so you have a firm grip (but gentle enough not to squash the pill). Most pills would have the middle section with an engraved line to help you split it in half, so that should help hold it steady with your tweezers. Now find your cat... here, kitty kitty. :)

When you have both your cat in one hand and the tweezers with the pill in the other, try to do this as fast as you can: hold your cat for the excess skin at the back of her neck quite firmly and with resolve and move it so her head leans a bit on one side. You'll notice that the skin you're holding for will push the cat's skin next to the edge of her mouth slightly open, like she's giving you the looks why in hell you're molesting her. Now go with tweezers pill first over that mouth edge and press a bit so the cat opens her mouth. Insert the pill and pull the cat's head upwards while massaging her throat with a few downwards strokes, maybe for two to three seconds.

All done. I don't have any photos but I hope I described it well enough so you can imagine how that would go. Make sure you're persistent enough the first time around to succeed, otherwise you'll have a hard time finding your cat to do it the second time around. It should take you at most 15 seconds all of it, and the cat won't resent you too much either once you get a hang of doing it. After 2 minutes of conversation with my veterinarian, she explained it to me well enough I've done it good and fast the first time around. And she saved me a few bucks for some odd looking plastic apparatus, whatever its name was.