My current employer says that I will get to learn to do duct sizing as time goes on, and that we will leave it to the estimator/designer to size the system.

I want to learn NOW! He said he will send me to classes next year to help.

I want to be more valuable, knowledgable, and competent.

I want to learn specifically how to size the duct system to each room of a house.

I want, I want, I I sound like a little kid?

Is there anything I can do in the mean time to further the process? Are there any programs for my computer that will help?