By that I mean it is harder to rack a slide if you grip it and then start slowing building rearward pressure through you hand than it is if you grip and make a sharp, firm snap back and release.
There are many ways to do it, depending on the gun in question, hand size, grip strength, etc. What works for some people on some guns will not work well on others, or for other people.
Sure, in the beginning, SOME of it may be psychological, but ONLY in the beginning of a shooting career.
Sometimes, it is simply a matter of hand strength, gripping area of the gun, and the gun's resistance (the combined resistance of action, recoil spring tension and hammer spring -hammer down).
points the pistol forward about 45 degrees down, arm stiff, and jerks the rack back with the off hand. I call that the bow and arrow, 'Robin Hood Rack'.
This works for people with enough grip and strength. A "real" archer will also tell you the better method is to HOLD the string, and PUSH the bow.
This works for many people who cannot pull back the slide. Don't. Hold the slide, and push the frame forward.
Also remember different guns are different. A Ruger .22 is pretty easy. An Ortgies .25 is NOT, because it is stiff, and the area of the slide to hold on to is very small.
I know many full grown men, manly men, who cannot "rack the slide" of my Auto Mags. It is one of the most difficult I've ever found, and even though I've been practicing it for over 30 years now, its not "easy" even for me. Try a Desert Eagle (which takes more strength than any service type auto) and then make the area of the slide you can grip a lot smaller, and you're getting close to what it takes to rack an Auto Mag.
If the gun has a hammer, cock it, then rack the slide. MUCH easier.
Looks easy in the movies, but movie guns, if they actually fire at all, are made/modified to fire blanks. They don't lock shut the way a live fire gun does, and they have VERY light springs.
I know fewer and fewer people get this experience, but, ever drive a truck that does NOT have power steering? it LOOKS easy to steer, but it isn't.