I dread pushing the spreader up and down steep hills because of my bad ankle
Then get one of those shoulder-strap bags with the feeder on the bottom (AKA hand held spreader) to apply the dry granules. It'll be just as easy as using liquid due to not dragging the hose around and fewer refills, and far less dangerous.
I once had excessive exposure to liquid fertilizer and wound up in the hospital, and it didn't take all that much of it to cause me to barely be able to breath, could not lift my own body weight, etc. It was not fertilizer with weed killer or insecticide, just 30-0-0 mixed with 10-10-10.