Step 3: All the screws are black and there are exactly 22. Do not remove the silver screw near the buttons.
Step 6: Use a hair dryer to heat up the back cover adhesive before sticking it back on. If it is weak you can either use a phone case or buy a replacement peel-and-stick back cover.
I bought a replacement battery from Amazon and it came with a great set of small torx screwdrivers. My screws were definitely all T4
Step 2: There is a plastic “cage” for the battery underneath the glued cover. Ensure that you’re prying between the cage and the back cover. The cover is very thin and it should be removed with nothing stuck to it except adhesive. The ribbon cable for the side buttons can get stuck there too. Work on the side away from the buttons first so that you can see that ribbon cable and not damage it.
You can buy replacement charging coils for cheap. I posted a comment after yours describing how to line up the charging coil’s connector on the backside of the battery.
Step 5: Removing and replacing the charging coil is not described sufficiently. The four-wire connector that faces inside the phone must be correctly positioned and the batteries do not have guides or markings. I used a post-it note as a tape measure. On the phone side of things, paste the note’s sticky strip at the edge of the bottom and run the strip up to and besides the pins for the connector. Mark both rows of pins with a pencil. Repeat the same measurement from the side edge. Transfer those measurements to the battery holder assembly, making a hash sign (#) marking the future position of the four pins. Then stick the connector to the battery, placing the connector pads at the four intersections of the hash sign.
Several items were missing in the instructions and that cost me a lot of time.
Step 4: There are TWO (2) plugs and connectors to be removed. NEITHER are ZIF connectors. They don’t have that flip-up gate and ribbon. They are both plug and receptacle. The one not shown is for the buttons on the side. To remove both connectors, pry up underneath them.
Step 5: The connector removed with tweezers is glued to a backing plate. Use the tweezers to pry under the backing plate. If you pull up on the wire you might peel the connector off of the backing plate.