Ingalls are easy!
I just bought a front/rear Ingalls camber kit for my car. I easily installed both of them in like under 2 hours. I mean its really easy. Then when you get your new wheels, take it in and get it aligned it will be easy for them to align it with the kit on and it will be done right. I wouldnt reccomend the washer thing because its very inaccurate, but do what you want. The rear camber kit is not just a bolt and some washers. You would have to see it to understand. If anything, install the kit yourself and get it aligned. Dont have a shop install it, or you will pay a lot.