I did mine myself, but I've been around the block with s chassis and at the time new swaps haha, I think the biggest secrets are the wiring. You can buy bolt in mounts, driveshaft, etc so most of the swap is self explanatory, but the wiring is a headache lol. I did the Zfever, got my ecu and wiring back (late) but it did fire and run everytime. I love the vq, won the 2011 Grassroots Drift Championship (and 3 of 4 rounds) and am currently going crazy with rebuilding it for boost. Here's a link to my thread,
http://zilvia.net/f/chat/337935-350sx-nw-build-up.html