Your BCD’s releases should warm you enough, but to only if you have done them properly. In order to get yourself warmed up properly, your assistant or buddy should check on the tank band that connects the BCD to the scuba tank. The band should be tight so that the tank will not slip out even when you jump into the water. You do not need to worry too much about the waters, as the seas usually tend to be calm around the hotels in Langkawi, though you may require an initial learning curve, these are much easier to learn they seem, and could end up being more fun than you’d ever imagined.