I'd recommend picking up some Brinks padlocks to help with transitioning to the 570. They are only 4 pins, but have 1-2 security pins as well and have great feedback. It helped me get comfortable with security pins before making my own attempts at the 570. As for the LOTO, the small keyway was the hardest part for me, and I would at least try that after the 570 but it might still be a bit tough. Best of luck!
Interesting. I'm not sure, I haven't seen them around here but I found this Brinks laminated on Amazon. Is that what you're referring to?
Brinks are somewhat cheap and have some really good feedback. A great start for spools :)