I got my first fixed last week, so I am right there learning along with you. I can't skid yet, probably partially due to the fact that I have been unwilling so far to tighten my cages as much as I should, and also due to the high gearing that came on my bike. Skips took some getting used to, but what helped a lot was realizing that at first I was keeping my back leg too loose and just trying to hop upwards; as soon as I started keeping my back knee more rigid and letting my momentum bring my back leg up my skipping became a lot more consistent/useful.