try to use as few points as possible only place a new point when the direction changes and if you cant get it clean keep your hands on command z and just keep trying till you can make it as smooth as possible
i would agree with practice a lot and don't use a lot of points.
that and just try keeping the curves along the edge of what your tracing and you'll be fine. just start on some simple objects and then move on to harder ones when you have the basics down.