Hey, im scuba certified and everything, ive been on like, 25 dives or so. i was considering renting an underwater camera on our dive vacation to the Cayman islands, and i was wondering if its really hard to dive with a camera to deal with? do i have to be more advanced before i try it?

It used to be tough diving with underwater cameras because they were in big bulky housings but thanks to the age of digital photography, both cameras and cam corders have become much smaller and easier to manage.
The bulkiest part these days is the strobes used to create better lighting. Strobes are needed to restore color that is lost at depth. They need to be on strobe arm mounts away from the lens of the camera so they can light the subject rather than the area between the camera lens and the subject. Using an internal flash will reflect back light bouncing off the particulate matter in the water which will show up on the pictures, which is called back scatter.
Make sure that the camera you rent (or buy) is rated for the appropriate depths that you will be diving.

The chips used in digital cameras are more light sensitive than conventional film cameras so without a strobe the pictures can also be good. (better with a strobe than not).
Digital cameras also allow for on the spot editing as you can view the pic while diving and delete it if you aren’t satisfied with it.
Here is a link to some of the underwater cameras out there.

http://www.visibilityunlimited.com/page/scuba/CTGY/Underwater-Cameras

I do suggest that you don’t bring the camera down on the first dive of the trip. Treat the first dive as an acclimation dive to get any weight or equipment issues worked out.

P.S. You will love Grand Cayman. Make sure that you dive stingray city while you are out there. Stingray City is a definite Kodak moment.