Some years ago I offered to be crew on a
trawler heading south just as you plan to do.
It was a tooth shuddering experience against
wind and waves the likes of which I never wish to experience again.
Your forward speed will be very slow and wet, and your fuel burn will be exorbitant, so just be aware of that.
Once past
Georgetown, plan your days run or overnight run with a fuel stop in mind.
The trip south is well documented in various
cruising guides and it behoves you to get one on of these and take notes.