Practice the manual pump lever at home. It doesn't take as many 'pumps' to raise the camper as you think but is good exercise; mental and physical. Plus you aren't trying this in 90 degree temperatures in a campground miles from home. Hindsite is 20/20.
The small "lever ' on front of the pump allows lowering but only turn it a minimal amount or the top will come down fast on you. Hindsite is 20/20. You can adjust the lowering speed by how much you turn the lever.
Keep everything in this area, pump, batteries, wiring, etc. as clean as possible though it does get dirty when traveling. I wear disposable nitrile gloves for this and other jobs like emptying the holding tanks as I am allergic to latex.