How to operate the slide of an autopistol if you (like me) do not have Hulk-like arm strength:
(All directions will be given assuming that your right is your dominant hand. If God put your right hand on the wrong side, simply reverse the description.)
First, hold your arms bent at the elbow, so that you're holding the pistol in close to your body, about tummy/bottom-of-the-ribcage level.
Next, reach across and grasp the pistol's slide from the top near the rear with your left hand, with your fingers on the right side of the slide and thumb on the left. Squeeze with your left hand as hard as you can, using the whole hand and not just the fingertips; the gun's made of steel, so you aren't going to crush it.
While pulling slightly to the rear with the left, punch away from you with the right, the hand holding the pistol's grip. (You can push a lot harder than you can pull.)
As the slide reaches the rearmost point of its travel, let go of it sharply. Do not ride it forward, as this could cause misfeeds or cause you to pinch the bejeezus out of your hand in the ejection port. Just let go and let it slam shut; it's designed to do that, so don't worry about hurting it.
Practice this a brazillion times, and it becomes second nature, and all your friends will think you're a lot stronger than you are when you're working the slide on big ol' auto pistols with ease. Let them be baffled for a couple minutes, then let them in on the secret.