If you can't replace your storm door, you'd better sell off all your pins and anything that has an electrical cord, since it's only a matter of time before you shock yourself to death.
It'll take more actual TIME to do this than actual WORK, but unless you're BUILDING a new storm door (which you'd still be able to do - it's nice to make something yourself that beautifies a house from the OUTSIDE too....I've got an article if you want to give that a go), budget 2 hours for this, and when you get done early, use the extra time to congratulate yourself with several dozen downings of your favorite libation.
Reading the directions beforehand (since you've never done this before) will make the process quicker and identify any possible tools you'll need to round up before starting.