Some of the best swimming lessons are those that are taught to you individually. You will find that when you are working with people as a group, you wont get as much individual attention as you will with a personal trainer. It may cost more but is well worth it.
One of the most important parts to learning to swim is that of being able to able to know how to protect yourself in and out of the water. This means that youll need to make sure that the school that you take swimming lessons through is one that provides you with the best of the best in education.