Definitely agree one at a time - see my comment above for more detail. Also possible to slightly warm the back of the phone first using hair dryer set on low. This loosens the adhesive if for some reason you break a strip off & have to pry the battery out (CAREFULLY)
OK - second most challenging part of the swap. TAKE YOUR TIME! It is hard to pull the strips out without getting them caught on the metal edge parts inside which can tear them, but do them one at a time, pull slow but steady, and as it stretches, grab the tape closer down near the body of the phone. You will not believe how far these things can stretch!
I was successful with getting 2/3 of them out but the one closest to the guts - the first one I tried to hurry - broke off. I got the other two out then needed to use a credit card to get up & under to loosen the battery. Another video I saw showed slightly warming up the back of the phone using a hair dryer set on low which would loosen the adhesive, but I did not do that. I was able to get the battery up far enough to use the tweezers to grab the adhesive and then pull it out.
FYI, in the video she uses the spudger for this but I think either one will work.
FYI - I used some blue painters tape wrapped around a piece of cardboard to hold the screws and brackets in place, in order, so they did not get lost. Some of those screws are MICROSCOPIC so be careful!
I also suggest having very good lighting, even a camping headlight for hands-free well lit work space. You will thank me later :-)
This was by FAR the most difficult part of this whole thing. I confess the spudger was not cutting it so I used a butter knife to get into the small opening first, then used the spudger to go around the screen.