Well, I didn't do it in my truck (no $$$ for it yet), but I helped a friend w/ an '00 Frontier do a head-unit swap and I didn't like getting the old unit out...the stock wiring harness disconnects were a real pain to pull out of the old head unit.
At least the soldering/crimping you can do in the comfort of your house.
[edit]I should add that a few of the people here have done really trick stereo installs, if you want advice about anything X specific you should check them out. Gearhead1972's install comes to mind...[/edit]
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Vikram/gothamist -- MAXC member
http://www.4x4LO.com [This message has been edited by gothamist (edited 05-05-2001).]