If your equipment kills you, it's your fault!

#1, Don't press hard on the lid when seating it. Use just enough pressure to do the job.
#2, Foot pumps are operated by feet. Use them.
#3, Pour some hot water on the lid to expand the platic a bit. This will make it easier to remove.
#4, Lightly place a hand on top of the lid. This will prevent the top shooting off like a rocket.
#5, As you pump, note the pressure. When it starts building up, don't pump so hard.

The foot pump is great when used properly.
Take care, stay safe, wear protective gear, get somebody else to do it.