I know some will claim they find them easy to get while snorkeling but my experience has been that you need to be diving to have a reasonable chance of success. In general you need to look for a area with lots of available nooks and holes the lobster can hide in. A dive light is almost a must because you need to be looking under coral and ledges. Decent gloves are required and a tail snare will give you a greater chance of success. Most of the established dive sights usually have lobsters. In general I see a lot more lobsters in the USVI than the BVI. I think the commercial pressure is greater in the BVI. The area from Grass Key to Congo Key is usually pretty good.
G