We just purchase a 24' round above ground pool from some friends of ours. Got it to the house & started installing it this weekend. We've got the wall up & liner attached now for the tricky part. We started filling it with water yesterday after lining the previous holes up for the skimmer. At what point should we attach the skimmer? The more water that gets in the pool the harder it is to line up the holes. We would greatly appreciate any advice you can give us. Thanks in advance.