Thank you Andrew and others that put this together, with your help I can still enjoy using my old MacBook for a couple of years more! I agree that you might just skip the whole assembling part if you “just” disconnect the trackpad - you’d need to just get the battery out and you can access the trackpad immediately. Although it was an exciting journey to disassemble and put it back to together - thanks for giving me the chance!
This is indeed a tricky step. First time, after following all the steps and reassembling I had no screen, which freaked me out. Luckily, another go at the connector did the trick and now I’m a happy owner of a macbook with a new trackpad. Thanks!