I don't square them unless it is necessary to the pattern. Squaring blocks usually ends up with blunted points. If your blocks are within 1/4 inch of size, just fudge it when you are sewing and they come out just fine with SHARP points.
I no longer join swaps that recommend squaring off before mailing. I usually fudge when joining blocks, but I can't fix something that's off if it's cut off. Off it goes into the orphan bin.