short trading

Hi Guys

I'm new to share trading. I reag a lot and try to learn how to do day trading and swing trading. In many books they refer to short trading. I learnt the concept of short trading but need to know how it really works (A-Z). pls advise whom to contact, how to borrow shares ect.... If some one knows how to do short trading pls be kind enough to share your knowledge. It'll be very much appriciated.

Currently I have a comsec account. Can i short trade using this AC

Thanks a lot
hiru