How many of you have replaced the pool liner yourself? I have a 20x40 with covered stairs and I'm debating the professional versus DIY method. Roughly I can find a liner for 1200 versus paying a pro 3200. My issue is also time, I'd have to use vacation days to do this (I'm a father of 4 children all under 5 years old). Anyway, just wanted to hear how others fared at this and how often you've had to replace the liner.