We strongly recommend that all users of the lesson space should use a headset with an integrated microphone, this will give you the best lesson experience!
Without a headset the sound that comes through your speakers will feed back into the microphone and the user at the other end will get an echo, which can get really confusing! Not using a headset might also make the quality of your recording of the tutorial worse.
If you are unable to find a headset with a microphone the lesson space will still work just fine, so long as you're wearing headphones to stop any feedback to the other user. Lots of laptops have microphones built in to the top of the screen. However, you'll need a separate microphone if you're using a desktop.