I have been meaning to get back to this thread to correct what may have been an impression I made that you *should* get some sort of instruction if you want to do swimming. I wouldn't want an inability to get that to stop anyone from swimming.
In fact as far as calorie burning goes, I think I heard that you use more swimming with inefficient technique!
If you can afford it however, a little instruction can be helpful (espeially if it is going to be your main form of exercise). Swimming is a sport where technique can make a big difference, more so than in other forms of exercise. I swam as a teenager and the grounding I got then means that I can contemplate a race like the 3.6km with not much more than a month of training. In fact, if I just wanted to "finish" I could get by with less.
Our leisure centre has swimfit classes where you can go along casually for $3:50 (in addition to pool entry). They do laps (I imagine there is quite a group there) and there is someone who would give you some feedback. If you mostly swam by yourself, but joined a class like that once a month, and each time got one tip on how to improve, you would get better over time. But of course that is just what we have available, and everyone's areas are different.
Leah don't be too jealous. While I said I was aiming for 6km - I actually only did the one I mentioned! (1:75) No creche open last week so although I went to the pool (my eldest is doing vacations swimming lessons) I spent all my time in the water with my toddler.
Theresa and An I am SO with you on the sleep thing. My youngest wakes me up between 5 and 6am and so of course I should go to bed by about 10 but that would be a really early night for me! Sometimes I am so tired I fall asleep after breakfast.
DH is an extreme night owl. I got him to commit to an 11:30 bedtime (or else he would be up later) Sun-thurs but the tendency is that I stay up with him! (but he sleeps until 8:30)
I also tend to leave lots of tasks til after the girls are in bed and that can take til 9pm!