It depends on the model year of your vehicle. The console outlet shouldn't be too difficult. Usually a two wire connection, for power and ground. If it's a direct replacement, should be a matter of removing the old plug, connecting the wiring , making sure it fits snugly in the OEM opening for the old outlets. My experience for my 2007, was that I had to pull up the center console to reach the outlet wiring, and remove the old outlet.
If you are planning to install one in your dash, it's a little more complicated. On the 2005-2009 model, you have to remove the front radio trim plate, to reach the power outlet structure and wiring. I suggest viewing the instructions for wiring a push button start for 2005- 2009 Mustang, on the American Muscle website. This will give you a good idea of what is involved.
2006 GT, Strut Tower Brace, Gas Hood Struts, FR Intake Plenum cover, Metal Fuse Box cover, Moroso brake reservoir cover, Rear shock tower brace, Front Bumper Lip Spoiler, JVC DVD Head unit w/ back-up camera, satellite Radio and USB input, 2 - 12" sub-woofers, 4 - 6"x8" speakers, 2 - 6.5" speakers to replace the door subs, 3 amplifiers, LED lights under the hood and in the trunk, chrome e-handle on parking brake handle, chrome cup holder trim, and trunk lid cover with running pony emblem.