raise the back wheels of the tractor up as high as you can leave front wheels on the ground
stretch the boom out as far as you can; I actually take the dipperstick off usually and let the boom fall to the ground
remove the boom pin from the main frame
use hydraulics to suck the rod in then shut the engine off, work the boom lever a few times to relieve any pressure
remove the rear boom pin and then reach in & pull the cylinder out, then disconnect hoses.
there's other ways to do it but that's the way i did em