Make sure the seal is seated properly and pushed all the way on. Do this dry, as the seal needs to stay put on the glass and not slide off. This is to make sure that you aren’t left trying to force the seal to stick to the bottom of an up-curve, after you’ve pulled it tight around the rest of the glass. On a Bug windscreen, where it curves upwards along the lower edge, it’s probably a good idea to start in the middle, at the bottom. Open up the seal and start to work it onto the edge of the glass. For the sake of neatness, it’s usually best to put this at the top, in the middle of the glass. Take another look at the seal and you’ll see a joint, where the rubber profile is bonded together. You’ll need to identify which slot is which and find the correct slot for the glass to go into. Take the seal and have a good look at it.
Set the window down somewhere where it’s easy to work. Trying to do it any other way will not end well. To spare you a lot of pain, there’s only one correct order of assembly for window seals with chrome or plastic trims – 1.