I found clipping into fixed easier. Push down then when the pedal comes up use that to get you on the seat, then slow the pedal down, and put your foot down for the pedal to clip into, wait till it comes over then push down on it.
Stopping is easy, slow down so your not moving fast, then just unclip like normal, try an time it right so your foot is always in the rigt place to start off, if not either roll yourself back, or pull the front brake and lift the back wheel up so your pedal gets in the right place.
It does get easier, just relax more, relax your legs and enjoy the ride. The times i have forgot to keep pedling is when i have gone from standing up to sitting down, which you will find soon goes.
Leg break as you come up to lights, dont do hard leg braking, but just roll up to them and take your time, you should find that you just keep pedling. Do it more by just relaxing your legs so that they slow the pedling down.
Maybe dont concentrate, just relax your legs and let the pedals push your legs around. It'll get easier.
Relax, smile and look good
