Hey Grainde,
I do set everything up one laser at a time. In fact I usually get everything set up Friday night , since it takes up to an hour to transform my garage into my work area and get the lasers mounted according to what I want to try to shoot. Obviously the more complicated the set up the longer it takes to set up. Then when I am done with my Saturday house cleaning (wife's orders) and other chores, I can start to shoot immediatley. Just warm up the fog machine and I am ready to go. My camera (Canon SX40) has an electronic viewfinder, which I do not use for shooting lasers, but also has a 2" screen that extends out (like a video camera) so with protective glasses and a baseball cap tilted down, it gives me good protection when getting everything set and and when photographing. I have not had any accidents since I have been doing this, but I realize it only takes one mishap so I try to be as safe as possible. I am able to view everything on the screen before I shoot. I had my last eye exam about 4 months ago and no change in my vision. Also, most of my lasers I use to photograph are not too powerful (but powerful enough if you check out my signature) I have found that very bright lasers are harder to photograph as they bleach out the color. My glasses are not good for red lasers but are good violet, green and blue lasers. I appreciate your safety concerns!