It took me all of about 30 minutes to do. Here are the basic steps I did:
1. Remove console cover and center stack cover.
2. Remove stock head unit (or rather, slid it out to gain access behind it.
3. Used the included 12V outlet and tapped into the 12V outlet wires in back of the center stack.
4. Unplug antenna lead from stock head unit and plugged it into the FM Mod pigtail. Plugged the other pigtail back into the stock head unit's antenna jack.
5. Ran XM antenna wire up into the center stack from behind and plugged it into the FM Mod.
6. Plugged the Cig Lighter plug from the Roady2 into the 12V outlet I wired up previously.
7. Ran the antenna and power wires out just above the heat/AC controls.
8. Reassembled everything.
9. Plugged the power and antenna leads into the Roady2 and mounted it with the included vent mount to the left-hand center AC outlet (a temporary solution until my wife figures out a more permanent location).
Wish I had pics, but it's not too difficult.
Edited to add: No adapters needed. I know on the package, it mentions that some car stereos might need adapters for the antenna plugs. Nissan uses standard antenna connections.
_________________________
2002 Just Blue XE 4x4