Success!

With step-by-step help from engatwork via the telephone, I was able to completely charge my vehicle's a/c system this morning. Opening and closing the valves on the recovery/recharge unit at the correct times was key.

I was able to go through all of the steps, and after the vacuum was pulled for 45 minutes all 38 ounces of refrigerant were sucked right into the system. I didn't even have to start the car to do it.

So, a HUGE thank you to engatwork for his help.

And thank you to duxthe1 for his post that helped confirm where my errors were.