Experience before certification

Hi all,
I am new to Citrix and I would like to know how much experience do you need to take the Citrix certification (CCA). I was thinking of preparing for the Presentation Server 4.5
My company has a Citrix server but hardly had a chance to work on it. I was thinking if could study and get certified, maybe I will get more time on the server.
Please let me know about it.
Thank you.