That's the first step. Next is to understand how much you need to apply. Well, that's confusing, too. My soil test results said to use a pound fertilizer for 100 square feet. I don't have a scale, so I just took the bag out into the garden.
Most people do, unfortunately, and they way over apply.
An easy way to avoid needing a scale is to just measure about two and a quarter to two and a half cups of fertilizer. That's about equivalent to a pound. So, this equals a pound. Now, that's not a lot for 100 square feet. No, assuming that if that's your garden area, you've got to spread it very carefully in order to get it spread uniformly.