Do I need any special tools to install a drivers side electric mirror on a 2004 Nissan XTerra?

SOURCE: instructions how to remove door panel on a 1993 nissan truck

hey juan...if you're not familiar w/ it, which seems evident, its good that ya didnt tear into it anyways. is it fixed yet? it should be by now! eric dude

SOURCE: remove driver's side door panel on 2002 nissan altima

Removal instructions are available with images and step by step directions, www.carstereohelp.com/strnissan.htm

SOURCE: 2004 nissan maxima passenger side window will not roll up

how to connect wires into window regulator for maxima 2004 right window?

SOURCE: 2002 Nissan Xterra drivers power window wont roll down

Quite possibly yes...I would first check any relays and/or fuses just in case.  A few dollars for a fuse or relay is much cheeper than say $100.00 and a few hours of labor.  
You can purchase just the window motors from any major auto parts stores.  You can also purchase the window motor with the regulator.  The regulator is kind of like a rope and pulley system to lift the window up and down and the motor is attached to this assembly.  It is a little more expensive but I would change both.  I always change both just in case the regulator is bad and it isn't the motor.  You will have to remove the plastic interior of the door in order to change either the motor or the motor/regulator assembly.

Any questions, feel free to ask!

SOURCE: 1991 Nissan Maxima: Removal of front driver side door panel

This is out of my haynes manual
1 disconnect negative battery cable
2 on manual window equipped modesl remove the window crank using a hooked tool to remove the retainer clip.
3 on power window equipped models pry out the armrest switch control plate and disconnect the electrical connections
4 detach the armrest pull handle retaining screw then remove the inside door handle trim bezel
5 insert a wide putty knife, a thin screwdriver or a special trim panel removal tool between the trim panel and the head of the retaining clip to disengage the door panel retaining clips.then remove the remaining door panel retaining screws at the lower edge of the door panel.
6 once all of the clips are screws are disengage detach the trim panel disconnect any electrical connectors and remoe the trim panel from the vehicle by gently pulling it up and out.
7 for access to the inner door remove the door panel support bracket then peel back the watershield taking care not to tear it. it install the trim panel first press the watershield back into place. if necessary add more sealant to hold it in place.
8 installation is the reverse of removal