I did mine this weekend. A very easy job, about 90 mins to 2 hrs each door. Here are my tips.
Removing the old seal is very straight forward, no tips here.
Fitting the new seals:
Fit the door jamb side first, - no glue required here, the seals are held down with the chrome strips. Now is a good time to re-polish these strips whilst they are off. When you fit this side make sure that you streatch the rubber so that your screws are going through the holes in the seals. Fitting both strips ensures that you now have the bottom "square corner! right at the bottom of the door. STOP there and now focus your attention to the handle side of the door. Ensure the seal is not twisted now fit the seal to the top of the handle side and screw it into place with the tiny securing screw.
Now the fun bit, gluing the seal. I found that a quick setting glue is good here (but not too quick like superglue). You need a little working time but not so much as you are holding the seal in place for ages!! I applied glue to the seal in about 6 inch sections, sticking it to the contours of the door as I went along and waiting for each section to hold under its own weight. I started gluing at the bottom corner on the handle side, working up the door towards the top fixing, this way I knew that the corner was in the correct place. You will find that you can 'compress' or 'stretch' the seal slightly so that it fits well. Once this side is complete move back to the jamb corner and underside of the door. Starting from the corner glue 6 inch sections again working towards the handle side. You can make sure that the drain holes on the seal and the door align as you move along.
Leave to dry.
Cheers
Mark.