Spark Plug/Rotor/Cap service fees?

I need to replace the spark plugs on my 1991 V6 Camry DX...and while I'm at it since its cheap I'll probably replace the rotor and distributor cap. I've never done the job before on this car and it looks like getting to the rear 3 plugs is going to be a pain without removing the throttle body (although from what I hear it is possible).

I'm trying to decide if its worth it to me to do the job myself. How much labor would a shop (or dealership) charge to change my plugs for me? And if I let them do the rotor and cap replacement as well?

Thanks.