My advice is to practice .. starts, stops, changing gears, signalling .. the works. Find an empty parking lot somewhere where you don't have to deal with traffic and just work on the basics. Turning, stopping .. changing directions etc. Slow speed manuevers are the hardest to conquer.
When you feel in control and confident enough to head out on the road, stick to a few blocks of streets with less traffic for a little while. Work into it slowly. The more you practice, the more confidence you will build. The more confidence you build ... the more relaxed you become .. the more relaxed you are, the more fun it is.