I bought a coilover set a few weeks back for my Mk5, and it has been sitting in my trunk since then. I want to do this right, so what do I need to get in order to have a solid, problem free install? I won't be DIYing this; I don't trust myself, but I have a friend I can definitely trust with the install.

That friend said that there's a stretch bolt that shouldn't be reused, so I know about that. And the seller of the coilover set said most people replace a part with something shorter, but I didn't hear him clearly. If someone could make me a list of parts/special tools, that would be awesome.