The numbers on a powermeter do tend to bounce around quite a bit some meters more than others. You should learn to pedal smoothly with a steady power output particularly if you plan to race or ride with groups. If you haven't used a powermeter it takes a while to maintain consistent power with changes in load. Use your gears on hills and overpasses and don't ease up when you go downhill. Gives you something to focus on when you're in the middle of an interval.