Next top I did, I used both hands somewhat apart and Gently pressed (not pulling from bottom edge) it down over that roof edge. Then further downward (1/2 way) where it's curved less towards glass. Once you're 1/2 way down, the rest show 'fall' into place. I say gently pressed, because if it does seems to be going well, you can easier pull it back up. If you press hard to start that top curve & lower buckles, it tough to peel it away. Doing this in a warmer temp. helps. Hotter the better. That vinyl tend to have a 'memory' when pulled hard & 'retracts' afterwards. Hope this makes some sense. Real pain when it's the $$$ style