Pretty easy install really. Peel out the old one and install the new one. Put some weather strip adhesive at both ends as well as where it makes the sharp bend at the top of the vent window frame. There is also some seam sealer across the joint under the weather strip. Also if you took out the stainless channel piece, you can by repro foam seal or use camper seal available in roll form from any local hardware store. I have use it with good results.