yeah lots of places sell those little roll pin install tools that are basically just clevis pins. they definitely make things easier. although i've taken to just using a small hobby vise with rubber pads on the jaws to drive pins these days, once you get a few blocks to clamp on things just right it's the absolute way to go.Even easier with a 1/4” x 2” clevis pin! The forward take-down pin detent can be a bear to install if you have fumbly fingers like I do, and was the reason why I had “oops” kits before I got the clevis pin.
i've taken to using this hobby vice from the vaunted harbor freight for a surprising amount of things. one of them is working on ar/ak triggers and whatnot. no need to use my 6'' bench vise for something that only needs a few pounds of clamping force. unless you are torqueing barrel nuts or something, a hobby vice works great and i work inside in my ac instead of my hot garage lol.
https://www.harborfreight.com/2-3-4-quarter-inch-articulated-vacuum-vise-3311.html
if you shape a few pieces of scrap in certain ways, you can make clamp blocks to drive every roll pin in an ar upper or lower. even those dang gas tube/gas block pins which ALWAYS seem to be the trickiest and most willing to mushroom on ya.