I changed the battery pack as well without removing the logic board etc. It helped, that the batteries already were swollen, thus access to the glue stripes was easier. It works, if you give a little tension, pulling a pack upwards, and then work with a small blade or knife, and cut the glue stripes. It may take a while, but much less time than dismantling the whole macbook. If you don’t hurry, and don’t apply too much force, you will not damage anything. Beside the 10 cover screws you only have to loose 2 screws for the battery connector. After removing the old pack I used Methanol to remove the glue. I prefer this solvent to Acetone, because it’s less or not harmful to plastic (however, no warranty, just my personal experience). I was able to finish the work in 40 minutes, although it was the first time I opened my Macbook. Well, I am an engineer, that helps, but with dismantling all boards it definitely would have taken double the time. And more risks to break a plug or make a mistake while reassembling.