I’ve done a bunch of these in the past. One important tip is to remember: Once you have confirmed that everything is good to go - no air bubbles and it’s working with 99% on the battery meter..... tag the two side tabs of the front cover where they overlap with a tiny, tiny drop of crazy glue to keep everything together. Immediately after gluing, place the computer face down and allow time for the glue to dry so it doesn’t run down and drip onto the rubber seal which would screw up the seal for the next battery change. It’s tempting to pick it up and play with it right away, but give it a few minutes for the glue to set.