I can remove the deck from my 42" lawn tractor in under a minute and without tools so I simply remove my deck whenever I need to clean under it or change/sharpen blades.
Some people use an engine hoist to lift the back by the hole for the pin hitch or a chain around the front axles but with this method there is no safety in case the engine hoist piston decides to let go. I have used a jack & jack stands in the past, same for automobiles.