I fixed mine last night. Here's roughly what you do:
Start with the roof tilted up and the shade back. There is an inner black plastic piece that doesn't tilt up with the roof but does slide back with it. It looks like a big "U-shape" that surrounds the roof opening and the open part of the "U" faces the back of the car. First remove each end of the "U" by simply pulling straight out; they are held by clips. (If you are removing the right side you pull left; left side you pull right). Once the ends are removed, close the roof and then retract it about halfway open. You will see four phillips screws to remove the rest of this piece; the screws are on the front edge of the actual sunroof. Remove this piece and set aside.
Next, return the roof to the tilted up position. On the lower left and right edges of the actual sunroof is a short black plastic trim piece. Both of these trims need to be removed and there are three snap-in plastic pins that hold them in place. Start by pulling / prying on the edge that is tilted up, once you get the first one out the others come easy. Be careful not to break these, I broke one.
Once the above trims are removed, you can see the sunroof bolts. There are three per side. Use an 8mm socket to remove these. Once they are all out, gently push the whole glass upward and off. I set my glass roof in the backseat while doing the rest of the work.
Now, stand on your door sills or a step ladder so you can see above the roof. There is a plastic tray that catches water on the rear portion of the roof opening and this must be removed. It is held on by two Torx screws, I think T25. Mine were pretty loose anyway, but once these two are out, simply pull this out. I had to move the roof to the 'closed' position to get it out, even though the sunroof is no longer attached.
Now you're ready to remove the shade. Pull it all the way to the closed position and from above the car look down. You will see four clips attach the shade to little feet which ride in the metal guide track. I had to pop the two clips on one side off and then you can lift the shade on that side up and just slide the other side out. Use a little screwdriver to pop the clips off on one side. You might be able to just shove the shade to one side and gain enough clearance to just lift it out, but I actually had to remove two clips. Once the shade is out, 6 little phillips screws remove the plastic handle / vent on the shade. I cleaned mine and reglued the cloth with fabric / tacky glue. Make sure not to use too much or the glue will soak through and not look great when it dries. Also, when removing the plastic handle, every last plastic clip broke on mine during removal. The plastic is very brittle. The screws pretty much hold it in place though, plus I glued my edge back down anyway.
When you put the shade back into the track, pop the two clips back on so all four are on. Put one side in first, then push towards that side. This gives almost enough clearance to let the other side drop in. The clips are spring loaded, so just push them a little or flex the shade a little until you get them in. Then, just put everything back in the order you took it off.
The only thing to consider is sunroof alignment. The six 8mm bolts to remove the glass also adjust the up / down position of the roof. I put all six loosely back on, then shut the roof and tightened them up that way.
All in all, took me maybe two hours, now no more sagging cloth on the shade! Hope this helps.
