AR instruction manuals

This is being done right now with a good phone... as well as incredibly expensive systems for things like armored personal carrier turret  repair... but wait till consumer AR glasses arrive. I can imagine much more mundane tasks (like say, car repair) that would benefit by this sort of thing. Laster technologies makes the system I like the best so far.

I can see an app store environment pop up with instructions for every single possible thing you can imagine... from changing a printer cartridge to frying an egg (which I imagine would be harder to write due to a lot more variables)