Definitely not a space shuttle or even especially complicated, but.... Setting up an LP12 is one of those jobs that when you look at someone who knows what they're doing do it, you think wow, that's easy. If you're only doing it once and need to buy nut spinners and a jig, plus the jig to set arm pivot to spindle distance correctly (assuming a Linn arm) and then find a source for the service manual and bits and actually know which bits you need and what they're called etc, then it's just easier to pay to have it done, in my view. It'll take a dealer a couple of hours at the most unless you're doing loads to it.