A great tool for practicing is a metronome. A metronome is a device that measures the number of beats per minute. It makes audible clicking sounds per beat and can help you play your music steadily. Set your metronome at a slow setting and play along with it. When you become comfortable at the slow setting, slightly increase the speed. By using this strategy, you will eventually be able to play your music at the correct tempo.
Relax and have fun!