I've been commuting on fixed gears for few years and there is a learning curve. If you are new to riding fixed then it's better to start of slow and easy until you become comfortable controlling and handling the bike. Riding fixed in traffic takes skill. If you never commuted on a fixie in traffic then start with a freewheel until you get the feel for the bike and become good at riding, then change over to fixed. The more you ride the better you will become. Riding fixed is a lot of fun.