ZCP Lowering 'gotchas' to watch out for?

[r3zon8]

I'm looking to lower my e92 zcp and after reading through many reviews of lowering height, ride, comfort, I've settled on RD springs. I haven't bought anything but my second phase of this project is finding a local shop.

That brings up the question..what should I look for in a shop that lets me know they're familiar with my car and will perform a solid installation? I'm not a mechanic by any means and so I'd like to do my homework beforehand so I'm not fed BS by a sub-par shop.