DS went to his first 2 week block of daily swimming lessons last January. He had just turned 2. I choose a swim school that doesn't have parents in the water once kids turn 2. I did this for 2 reasons, because I have a younger DD to look after and because I really wanted it to be about DS learning to swim and be safe in the water.
I used to teach swimming and the lessons we used to do for under 2s with parents in the water were all about water familiarisation and fun in the water....we sang lots of songs....sprinkled water etc... I did all this stuff with both my kids myself when they were babies...perhaps I would have gone to lessons if some were available at a pool near me....but really you can do all this stuff yourself for kids under 2.
Lesson 2 and Lesson 3 DS screamed almost the whole time, but we persisted and we had a great instructor and by the fourth day he was fine. At the end of the 2 wks he was kicking, blowing bubbles, responding to the commands 'reach for the side' and 'pull yourself up', I was really happy with it all. Recently did another 2 week block in the April school holidays, it was at our local country pool though....and unfortunately the lessons were not nearly the same standard as the city swim school we went to....but I was happy for DS just to practice all his skills again.