Conduct and record a screen sharing session with someone you know. This direct method is as good as the testing sessions face to face for most purposes, contrary to popular belief un'obsoleta. No, you can not see the facial expressions of the participants, and yes, students should have a high-speed Internet. However, facial expressions are usually not of practical use as a feedback on the design (you have to trust me on this point) and high-speed Internet is becoming the norm. You'll need a reasonably fast computer with a stable connection and Skype. It would be even better to have a headset, not having to handle the phone during the test.