I found this guide to be great. My first time replacing a battery on any laptop. The only hard part was of course removing the old battery. I used the hair dryer method I saw on YouTube. Took me a while, over an hour, only because it was my first time and I wanted to make sure I did it right. Everything powered back up and is working normal. I am so glad I found these guides. Thank you so much. Apple store here in Jacksonville, Fl wanted to send my laptop out to a service center for a track pad replacement, if that was what was needed, for up to $400. Meaning, it might not cost that much, but it could, so be prepared. My issue was a trackpad that was not clicking any more. Fiddled with the screw a bit and it still wouldn’t click right, checked the battery cycle and saw that it was at 890 so that needed to be replaced. So got my battery from here and replaced that and fiddled with the same trackpad a bit and it is better, but still won’t click the same as new, but it does work just OK.