Im getting some rust behind the top windshield molding.

How easy is it to replace that part? Does it just snap back in place or does it need to be professionally fitted?

 

Ive never dealt with it other than folding it up on the top portion for my gps antenna, but its one of those things that if it leaks, the dammage bill could quickly add up. Id say its atleast worth trying it on your own, but check to make sure if you replace it theres no leaks. If you dont do it right, youre back to step one and you can just get it professionally fixed.