What do you have to be careful about when changing a car CABIN filter?

I have been told several times you have to be careful about something, but I can%26#039;t remember what. I know once somebody didn%26#039;t close it up correctly and rain leaked in my passenger side floor.|||be careful not to rip your dash to all hell. put it back together the same way you took it apart. if you have bolts left over...u might have a prob. lol.|||It all depends on the model of car...which you didn%26#039;t mention. A lot of cars have the cabin filtration in the glove box behind a little door....it%26#039;s pretty simple to change it...open door, remove filter, replace filter, close door, close glove box. if your car has the filter in some obscure place look in your owner%26#039;s manual or if that fails go to a Pep Boys, Napa, or other large chain auto supply shop and ask them where it is...they have always been helpful for me when I have basic maintenance questions.