Most definitely DIY. Can't tell you how many people I know who have easily fixed their own.
Just follow the directions posted. Make sure you turn the wheel to access the screws before you remove key from ignition. Then disconnect battery and let drain for a bit to completely decharge car.
I see you're in CA, not sure where specifically, but there is an upcoming Work on Cars Day in Sacramento. There will be lots of resident experts there who can assist you if need be.
Here are the details....
WOCD - 11/1/2008