I had a bad accident five minutes after getting my first fixed -- tried to coast at about 18 mph, ended up eating pavement.

Once I put toe clips on (and learned immediately how to flip in without coasting), I had a much easier time not coasting. I found that my feet ended up flying off the pedals at the top of the turn without toe clips for the first few days, so my suggestion would be to put them on and immediately get used to them. Since then, I haven't had problems at all.

Find someone who rides fixed to help you along.. LoRok did so for me, showing me the proper way to skid and trackstand and tighten down the traps while riding.