Thats pretty funny. Happens to me as well, give me 3 or 4 spots and im gonna hit every one of them at some point but put two trucks on either side and I can slip it in first try.
Had to do a sharp blindside yesterday. Got out twice just to make sure I was setup right. Blindsiding is much easier IMO if you don't have turn the trailer as much so try and set up as close to straight as your space will allow. That way you can bring the tail of your trailer back into your mirror if need be. But I don't have 100 years experience like some of these guys. Lol.
That's quite common. I always said I need something in the way not to hit. Try using a glove, rock, piece of trash or anything for a reference pointe.