One of the toughest things to do is to maintain an open mind when one has had experiences which run counter to the natural instinct to welcome others. This is the true spoilage which sad, or evil, folks can bring to a society. It is very hard to over-come, and sometimes it takes a force of will to be vulnerable yet again.
(Boy, did I almost go on a tangent!)
Welcome Cave Troll.
When I was doing improv in Chicago, there was a frequent visitor to the performances who had had his name legally changed to "Caveman." Even his checks were marked "Caveman." Nice enough guy, but one wondered...well, a lot of things.
That notwithstanding, I hope you find some knowledge and acquired skills here. Let me know if I can be of some assistance, although most others have much greater technical and specific model knowledge than I do.
Be well and safe.