What is the difference between 'me' and 'my'?
The sign for 'me' or 'I' uses an index finger pointing at the chest. The sign for 'my' or 'mine' uses a flat, open palm placed flat against the chest. Handshape is the only difference!
Do I need to tap my chest multiple times?
No, a single, clear point or tap to the chest is perfectly sufficient. While you might occasionally see a slight double tap in casual conversation, a single movement is the standard way to sign it.
Which hand should I use to point to myself?
You should always use your dominant hand. If you are right-handed, use your right index finger to point to your chest. If you are left-handed, use your left.