I'd second that -- .380 ACP as a caliber has nothing to do with how hard the gun is to shoot, and Glock 42 is *just* big enough to qualify as an actual gun
It's not that hard to shoot well.
Another concern is not just holding and controlling the gun. It's also manipulating the gun. Clearing a misfeed by racking a slide smaller than a deck of cards is not easy to do under stress, and it's easy to mishandle the weapon. Magazine changes are difficult under the best of conditions.
And then there's drawing. I have a Beretta Pico now and I really like it so far, but that little sucker is not easy to draw consistently, and especially from the deep concealment locations where one would often want to carry such a pistol. I've tried dozens of times to draw from a belly band, and it's just too darn easy to fumble the draw that way.
I have never become comfortable with pocket carry.
The answers to these difficulties for me are either:
1. Train a whole lot more and become more proficient
2. Keep the Pico as a range toy and just find ways to carry a larger gun.
Can I make good hits with the pico? Yes. Can I get on target quickly and pretty accurately from low-ready? Surprisingly well. Can I draw from deep concealment without flinging the gun onto the floor? I'm not so sure about that one yet, and so being the world's greatest Pico Marksman won't help me if it's slid under the refrigerator
I know people love to hate on Sig because the early 365s had some glitches, but honestly it's an AWESOME little pistol. It's Beretta Nano sized, but can carry twice the rounds and has great sights on it. You can add a Hogue grip for better handling, or a laser or light, etc.
Pocket gun? Maybe, with big pockets. But fully usable? Definitely. I dunno -- I might steer you that direction. Heck it even comes with a thumb safety now if that's something you want.