UPDATED TO ADD: I did have him show me what I was supposed to do. Turns out I was measuring from the wrong end of the wall.
Now I have to say I can't really blame him for getting frustrated with me!
Justin, getting very aggravated with me over the phone because I can't understand his directions as to how to take a measurement in the playroom: FINE. I'll just do it myself when I get home.
Me: Hey, don't get mad at ME because no one ever showed me how to do this stuff just because I'm a girl. [I don't say, "Because I never wanted to learn how."]
Him, still mad but realizing he can't win an argument about gender roles: Okay. I'll just shut my stupid mouth.
[I don't say, "You do that."]