Sometimes you have to look the other way on safety to get the job done though...
I have frequently parts of 1 or more buildings that aren't accessible by normal means due to property lines, roads, water bodies,etc...how do you tyvek exterior walls or set windows when you can't get a forklift or manlift on that side of the bldg...and even the unheard of 60ft ladder with 3 sections isn't big enough???
You tell your amigos they have to do it on Sunday I noted id Saturday so nobody else will be on the job, and pray for the best. If you can trust them, and make sure they wear a harness and tie off. There are several ways they (dont) use.... easiest and fastest is the "see saw" technique...get a strong 2x10 or 2x12 with no knots, half the board inside the bldg6ft half of it sticking out with the fulcrum being a window sill...the heaviest amino or 2 smaller ones in a pinch sit atop the board at floor level inside so that the other guy can walk outside on the board and work there. Tied off to a header or 3 stud corner inside of course so falling to death is impossible... I know several others as well but this is the easiest and most common. Have seen this done more times than I care to admit. Can also do this out exterior door openings or other windows as well and then run a wallboard perpendicular outside to allow access to every square foot of wall outside for tyvek, zip system etc...
Sometimes you have to look the other way to get the job done. Don't like doing it, but there are some times when there simply isn't a safer way to do things without doing something insanely time consuming and expensive. I take the safety of all the guys I am responsible for serious, but you gotta do what you gotta do sometimes. FWIW, I spent over a decade building houses before I came to apartments, and OSHA is non existent in the house building market in NC, SC, and TN from what I have seen. We always laid off top plate of walls for roof trusses or rafters for example, while walking them . Backwards of course, with your tape measure hooked in front of you. To better explain...walking backwards, on 3.5inches wall, at least 2 stories tall if not 3 plus the foundation height...with a tape measure in left hand and a pencil in the right...making marks usually every 16in and squaring them with a speed square between 20 and 40 feet in the air. Not only did we never wear a harness and tie off, I had never SEEN a harness up close on a jobsite until I started building apartments. Every roof we ever sheetfed, every shingle I have ever nailed, chimney I have built , etc was without any safety equipment at all. This is the norm in house construction. So I never felt like some coward expecting my guys to take a risk that I would have never taken myself. We never even gave safety a 2nd thought when I came up, it wasn't an issue. My guys are the same way. The hard part is to keep them from doing crazy stuff all the time, not the opposite.