To be honest, this has not been much of a problem for my R4 xMagic. Maybe once in a blue moon shoving my hand in a tight server rack. My L1 xG3 was even better when I had it. Though, I will say my first implant, my NExT in my forearm (check the xrays below, just to the inner side of the ulna bone), has very seldom given me issues.
Both my NExT and xMagic have credentials to get into work (T55), and I switch which one I use depending which door I use. One door in particular is significantly easier to use with my NExT than my xMagic.
Very possible. It was my installer’s first install, my first install, and they claim it to be the easiest they’ve done on me out of my three. The position I used was very particular, specifically in a divot between bone, tendon, and muscle to avoid the strap-sliding issue @tac0s mentioned. If you would like more detail, I can take some pictures and share my experiences.