Quoted from Fezmid:I love art blades - but have never tried installing them myself because it looks and sounds intimidating...
It's pretty simple if you use Rapid TAC application fluid, as that allows you to reposition things if you're not happy with your first attempt at decal alignment. I've used it to apply decals with the playfields pulled out of the cabinets on my recently acquired Sterns, but have recently developed a method to install them with the playfields in the cabinet and in the upright position. The Rapid TAC makes that possible. I've installed a couple of sets dry when I first started putting them in, but that's much more nerve racking, so I don't think I'll be returning to that method.
Whether you go decals, mirror blades, or even if you want to keep you're black painted sidewalls looking nice. I'd suggest everyone buy (or make), something like these protectors which you use when lifting/lowering your playfield: https://www.pinballlife.com/interior-cabinet-protector-blade-set.html