Can I install these myself? CVC & Freq Valve

I have a 1990 Acura Legend, 2 door. I need a smog check for California.

I just took the car into the dealership to check out why the Check Engine light comes on occasionally.

The results are that it needs:

CVC Valve
Frequency Valve

The cost of parts and installation would be $540.

1. Are these parts user installable? I have average mech skills and have done non-computer car work in the past. If so, what book/manual would I buy to work me though the process?

2. Any ideas what these parts would cost over the internet or non-dealership parts place?

Any other comments/suggestions are welcome.

Thanks,
Tim