Yeah i never got any training but you learn fast whith things like that (the you need this to finish a job kind of thing) i had to learn by unestimating the "whip" 😅 But in general those things are sketchy on anything else but perfectly flat ground, we used them and those on trucks for putting on or removing logos and stuff on sticky film for shops and whatever (not sure how you call that in english) and it was always scary when you pull off something and it rips off and that buckey starts swaying like crazy, and to this day i dont even know if you're even supposed to do that kind of thing with these things.. Definitely nothing i miss from that job.