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When I started putting the velcro on the knits I kept having trouble getting started with the stitching. I worked out that my usual way of sewing the velcro starting on the short side meant I was going with the stretch and getting stuck. All it took was changing the direction. So I started on the long side and sewed down first then across. Too easy.
Another velcro thing that was bugging me was the way the little pieces just disappeared when I put them beside the machine after cutting what I needed. There must be little velcro bits stuck on all sorts of things by now. To solve this problem I have started putting the pieces in a zip lock snack bag beside the machine. The hooky pieces stay safe and sound now.