I did these on my 87 last fall. I remember the one side inside the door tract was the hardest. I want to say I started on the the top, fed the felt through the window sill, with the sills off. Pushed the felt in as far up as I could into the channel starting at the bottom, with the window half down or so. Then rolled up the window more, and worked and finagled the rest of the felt into that channel. Had the door access panel off, was using long plastic panel remover tools, and got it almost perfect after a while. It definitely took some time.