The first step is going to be to take out the old saggy ceiling that is currently in your car. This is going to be a tricky thing to do, so it would be smart to take your time with it and carefully remove it. You don’t want to rush into things, since you might end up damaging other areas of the car.
Once you have gone on to remove the ceiling, there are going to be some forms of left over ceiling parts and foam that will be stuck to the roof. You must now go on and remove these as well, since you want to have a good clean surface on which to place your new car ceiling.
Now, once the old ceiling is out and all the left over parts have also been removed, the next step is to go on and apply adhesive to the area where you will be applying your new ceiling.
After you have gone on to apply the adhesive, the next step is to go on and place the ceiling liner and all the other material in place.
After having done this, you need to attach the ceiling to the car firmly and make sure there are no loose ends. You can go on and use some tools to ensure that there is a snug fit and that there are no droopy areas on your new ceiling.
You also need to ensure that the ceiling has been inserted rather evenly and that you didn’t forget to attach all sides of the ceiling to the car.