wow, long time since i did this project! time flies , and I dont get on here much, but I still have my VX![]()
the two things I can think of is make sure you mark your wires. not as much of an issue if your not using the extra electrics, but if you have any problems with the wiring later on, its a good idea to have an accurate list, or wire tags to help with the trouble shooting. the second item is to use a really good upholstery adhesive like the 3m stuff, its more expensive, but well worth it . the cheap stuff wont hold up very well after some time and it'll have to be redone.
other than that, just take your time. if you can pull the headliner, do so, and put in backing plates ( a small piece of flat steel with threaded rivet bolts) for the front mounting will make for a much cleaner and secure install, especially if you off road.
thats about all i can think of..good luck!