I'm about to give up driving at night!

It is not exactly the easiest thing to do but as jkeck55 said, get a picture of the back of a dash and have it with you. I have an extra dash that I look at and was actually able to change out one of the circuit boards with it all in the vehicle. Wear short sleeves and no jewelry on your arms.

Oh, one more thing, if you have rubber arms, it makes it a lot easier!