What a great question!
I came across a blog addressing this question and thought I'd share it with you.
People can forget that dancing is a skill. And, like with any skill, it requires mental effort and practice to improve that skill. Unless you are a super genius, I would say it's pretty much impossible to become fluent in a foreign language in a few lessons.
Read the full blog here. So, my advice is to be kind to yourself (and your dance partner). Learning to dance is a journey, not a destination. Enjoy it!