You can definitely service the car, most techs have a telescoping support rod they can use. However, make sure that they are aware of this, as if the gas springs are working sometimes - they may forget - and the hatch can come crashing down shattering the glass.
We also sell a pair of stainless steel struts on our website that allow the hatch glass to open much wider, making service much easier and are less expensive than factory units.
regards,
-- Chris