Change blades lawn mower?

Set the mower on a work tabletop to access the blade(s). If it is a riding mower, put it on ramps. Locate the bolt(s) that secure the blade. Hold the blade in place with one hand while removing the...

yes

Physical because you cant put it back together.

adj the height adjusters wheels on a push mower. a rider will have a deck adj generally labeled 1-6