Open the passenger side door, roll down the window, drop the headliner, move the seats all the way to the front and lower the backrests all the way. Take the headliner, move it to the back of the hatch as far as possible, when you begin to bring it back out, twist it toward you while you pull it out but don't turn it more than 5-10 inches, as you get the front portion out, straighten it out and actually pull it out through the space between the dash and the A-pillar, you will have to bend it slightly being very careful to not bend the tabs in the back or you will be in trouble later puttign it back in. Lots of patience is needed and take your time. It will take 15 minutes to do it right after you drop the headliner and 2 minutes if you do it wrong and break it at which point, it folds quite nicely in half and will come out of any of the three openings.

Best of luck to ya. They do put them in through the windshield from factory. Stealerships say they replace the whole thing but from what I've been able to garner talking with the one tech i know, they just wrap the interior in plastic, tear off the old cover part, clean it up so the adhesive will stick and then put the "new headliner" (material) in and the clean everything up. the only place it's folded is along the rear quarter windows. It be something to find out if that's how they do it as you could remove the dome light and see how closely cut the fabric is to the rest of the headliner if you had one replaced under warranty. Now I would have to say that if you paid for one out of warrany and it cost you over $300, you better damn well have a whole new headliner. YMMV