This is the only real drawback to the PADI system, and it is a relatively minor quip. You will have trouble equalizing pressure. This isn't a problem for experienced divers, but everyone I learned with had some trouble with this. Water pressure changes far faster than air pressure, and you'll have to equalize every couple of feet when you ascend or descend. Your instructor should know a number of techniques for equalizing, so experiment until you find the best one.
Different techniques work for different people.
You will enjoy the course, and you will enjoy diving. Don't look at the course as work, and remember to relax and have fun. When the instructor is working with other people in the pool, explore a bit on your own and enjoy the experience. Good instructors and no-nonsense training. The best time to learn emergency procedures IS NOT when you are 60 feet under the water.