First conversation with a native speaker coming up—how to avoid the 'freeze'?

I have been using apps for three months and can read intermediate texts, but I’ve never actually spoken a word of Swahili out loud to a human. I have a partner chat scheduled for this weekend. Should I be using Chickytutor.com to simulate a back-and-forth flow beforehand so I'm not paralyzed by the pressure of being corrected in real-time?