The best way to practice,in my opinion, is take it slow & easy.Find a empty parking lot & just practice stopping and starting.Also work on making turns.Get your self mentally ready for traffic situations by visualizing what bothers you the most about driving in it,then practice how you are going to handle those situations that arise which make you feel uncomfortable.Then get on your ride and practice some more.Get a good feel for what your ride can & cannot do in terms of stopping and starting.For example,try doing braking practice,use a line and have that as your target stop line.From there you can establish what the proper speed is for coming to a stop and starting away from a stop.Or work on balance,with the ride not running.Take your feet off the ground,hold the rebel uprite,practice balancing on it.Put your feet down before you actually fall over,find its tipping point and become familiar with it.
It is important that you become comfortable in the saddle,and maintain a sense of control.Also practice using your mirrors,and learning to check them constantly for other vehicles approaching too fast on your rear.One way to do this is park on the street,by a stop sign and use your mirror to judge approaching vehicles speed.Become aware of using all your senses to keep your riding experience pleasurable.Practice lane positioning when stopping,by seeing where you want the scoot to be when stopped at a light,for example I usually stay to the far right or left in the lane and rarely stop square in the middle,always leave your ride plenty of room to manuver out of any tight spots.
Hope this helps a bit & do not let yourself think you cannot do it.It is something that just takes time & patience & practice,practice,practice.