When couples choose not to rotate you have a case of the blind leading the blind. By dancing with various dancers of different levels you will get a better perspective of what a good lead will feel like. In large classes you may rotate through ten partners or so and then jump back to your partner over and over. Start up the rotation a few steps away from your partner and by the time you rotate to each other you will have an idea what you both need. T he most important thing is that you are cool and comfortable.
Some people come straight from work and others are in shorts.
The shoes you wear are more important. Comfortable shoes that stay securely on your feet are imperative. The soles should be thin and flexible if possible. Thong sandals, platform shoes, and shoes with sticky rubber soles will make your life harder. Definitely Level One.