Some good advice given already! As you say, you just want it to not be an eye sore. I would suggest that you practice a little bit on some masking paper or any flat surface to get a feel for the spray can.
You want to do short controlled bursts with the nozzle while moving. Make sure you mask with plastic or paper any area close to the bumper as you will have overspray.
A little practice goes a long way to a better finish!
Good Luck, it's totally doable.