Joa,
While I do not live in your area, so I cannot comment on what kind of shops would do a body lift for you, I'd assume most offroad shops would if you gave them the instructions/kit.
Here are your options for body lifts, 2" or 3"-
https://www.4x4parts.com/nissan/body-lifts-pathfinder-c-117_354.html
It is not entirely complicated, in fact it was the first thing I ever did mechanically on any vehicle. There are good writeups on this site, and more than enough people have done them
if you run into trouble so perhaps you will decide to do it. If you're still looking for a shop to do it, I suggest contacting a local offroad forum or club to see who they trust to do work
on their rigs, and give them a call to see if they are interested in doing it.
While it isn't like cutting springs or changing coilovers, I wouldn't say that it is any more difficult or invasive. Unbolt a few select items for clearance, unbolt body, lift, rebolt, and
change a few things (gas fill tube, steering column etc).