Also take a look at the new JP WizBlades at wizardmod.com which are also very close to JP LE blades (color scheme and tone) as the Retro and PinGraffix ones are. They are well made from a thicker material and very easy to install.
I used a modified DRY method (removed the backing from JUST the mid section of the blades that are 'between' the playfield when lifted, and the cabinet side. ) Then by hand, I slide the entire blade into approximate place and then carefully position the blades in exactly the right place, making sure not to touch the exposed section. Then once in perfect alignment, press down the blade near the playfield where the backing is missing. Once that section is in place and adhered, then peel the remaining front and back of the blade backing and carefully lay it down working from the mid section to each end. Hard rubber roller the whole thing to make sure it all sticks.