Just a tip:
If you are definitely going to want a reverse camera sooner or later, I highly recommend you order one now, and install the stereo and camera all in one go, it will save you a lot of hassle. Reason being the wiring loom for the stereo can be tricky to tuck into the dash, so you will have to wrestle with the wiring twice if you install them separately.
When fitting the headunit; take out the two air vents allowing your hand to fit in where the vents are,
see guide: http://www.fordowner...ocus-2008-2011/
This way you can lift up the loom while sliding in the headunit.
I've 16 RCA's and 3 usbs at rear of mine aswell as the standard loom,
I found this method easiest when fitting👍
Remove both centre dash vents to allow your hand reach in to the rear of the headunit and assist fitting,
To remove the vents
Obtain two flat head screwdrivers,
Insert them in to the clips inside the vent and lift screwdrivers upwards while pulling out the vent.
Slide headunit in to cage until clips catch in to place: