its fine, i did it last year for the first time, was a bit nervy for the first couple of minutes but you get used to it and the drivers over there arnt as bad as you think. First time i drove i mounted the kerb as wasnt used to driving on the other side.
Just make sure you have the right insurance and book with someone reputable, either pick up the car from the airport or somewhere in your resort. Best to try and book something now though as if your going in peak season most of the companies tend to get booked up in advance if they arnt alredy!