Pretty easy to install without messing anything up, but they will put some wear on the barrel after you use it for a while, if that bothers you.
Once you got it in your hands, you'd figure out how to install it. Put the two halves together on the barrel, then put the roll pins in. It's a tight fit, but not impossible for anyone with a modicum of hand tool skills.
I've used several on various rifles and like them...No issues with the roll pins.