How do you access the windshield wiper pump?

Hello again.  I have gotten the answer to this question, but it was a bit confusing.  How does someone access the pump? I know it is on the bottom of the resevoir. Do they have to go through the wheel well or remove the battery, which is sitting over the whole resevoir, and get to it that way? Do we do both?  Please tell me the best way to get to it.  I already have the answer as to how to change it, I think.  Thank you!