I used to only swim occasionally. I would just watch my friends who swam competitively for school and try to mimic their freestyle. They would give me little tips here and there and that was it. I never understood the breathing part, either, but I managed to breathe on my right side only.
Two winters ago, I sprained my ankle during dance class. I couldn't run, though I admit I was desperate enough to try, and elipticycles as well as cycling was still uncomfortable. So, I got serious with swimming.
My form and stroke was a mess, but I tried and pool lifeguards noticed my struggle and offered plenty of tips as I practiced. Other veteran swimmers also pitched in with advice and even gave me some resources they've used to improve their swimming. One guy raved about Total Immersion books and DVDs, so I bought two of their DVDs. They are pretty expensive, but I found them to be worth it.
I am still practicing and still improving my technique. Just recently, I discovered that if I tilt my body a little more, I can get a deeper scoop with my arms and feel a stronger push. I am no expert swimmer by any means, but this doesn't stop me from tremendously enjoying it and getting a great work out, too! I hope that with this post, I can encourage people who are reluctant to swim for whatever reason, to give it a chance. It can be beneficial AND fun!
