If you are swapping a vista series pickguard on a standard series it shouldn't be a big deal at all, you may have to move over a couple of screws but the old holes will be covered up. You might not even have to do that. The pickups are cheap, they are alright but I will probably eventually swap out to seymore duncan pickups since the body and neck are so damned comfortable. The tuning keys will probably eventually need swapped, but they are miles ahead of the 80s and 90s squires, I have had the same ones on for about 4 years with no troubles, aside from my snapping one off throwing my guitar at the amp and then onto the floor.