Can this be done in short sleeves?
Yes, this is possible to perform in certain short sleeved shirts. They are common. Many magicians already own one.
Can my hands be shown empty before and after?
This is only taught on the Raven DVD.
Is there a setup?
Yes. The setup is done initially at home or prior to the performance.
How fast is the reset?
After the setup, the trick resets in seconds and could be performed back to back within a few seconds.