[Aarons72s]

I have done them with the window in. All the one's I have installed seemed to long so I trimed them with bolt cutters, quickest and cleanest way to trim them. Ive done it acople of times this way and haven had any problems. I agree with sweet72, I use a couple of small craftsman screw drivers to pop the old ones out. I usually use a 2x4 and a hammer to help pound the new one sin place, it keeps from hurting the fuzzies and the paint. As sometimes they dont like to go in very smoothly.