You are such a sweet husband for doing this for her.
My hubby is EXTREMELY supportive in my "hobby". He takes me to cake shows, buys supplies for me, and the time is takes when I'm working on a cake, just to mention a few ways. He is my absolute biggest supporter and when I'm about finished with a cake, he calls my best friend and my mom to tell them to come over and see besides sending photos of the cake to his family who lives out of state. I couldn't ask for more support than that.
That said, I told him about your post and from one cake hubby to another, his comment was "be afraid, be very afraid".
That line completely cracked me up.
This is an addictive hobby. I go to a cake show, I'm tired, stressed, never doing this again and I spend the time driving home planning cakes for the next show.
We can't wait to hear from your wife after her birthday and see her first cake!