I recently had my blower motor suddenly fail... symptoms were the front vents blew nothing except a small breeze when driving but nothing when stopped. Rear vents blew just fine.
The picture above was very helpful, but for those who are wondering, Part #5 above is the blower motor, and its super easy to replace.
Take out two of the 3 7mm bolts holding the cover and rotate aside under the passenger side dashboard. There is a tab that you must lift on the blower motor, which allows it to rotate out like your unscrewing a lid off a jar. Unclip the three wire harnesses and replace with new motor.
All I had to do was remove and clean the wires a bit and it went back to working. But it saved ~$400 in repairs. Thanks to the above poster for the pic!