Removing and Installing gas charged lift supports?

[Kiiii]

I'm wondering how I can do that because my old ones are failing on me, so I purchased new ones, but I have no clue how to remove the old ones and install the new ones. Could I please get a thorough explanation on how to do this task? Thanks in advance. Oh and my car is a 1997 Eclipse GS Hardtop...

 

[Defiant]

Prop up the hatch with a piece of wood, loosen the fasteners, remove one end while being prepared to fight the pressure in the strut, move the end so it's away from the bodywork, remove the other end, install that end of the new one, wrestle the other end into place and tighten up. Repeat on other side.
Do not let the hatch drop on your head. It is heavy enough to kill you.