The bottom edge of the charging coil connector is 2.280” from the USB connector side, and 1.790” in from the button side. I used a caliper to measure, and reposition it on reassembler. This flat cable wrapped around the side of the battery along with a larger flap. The wireless charging loop also had another flat cable and 2 contact pins that goes up the midframe to near the lens. There was a small rectangular end on the flat cable, with an alignment pin. I had to peel this off to work on separating the battery from the charging coil. I reassembled the charging coil back into the midframe, using the slight indent in the midframe as a positioning guide. I then reattached the flat cable and rectangular end, pressing down to make the alignment pin go through the hole, and the adhesive to stick again. The new battery came with a slight curve, after pressing into the adhesive, wrapped the flap and flat cable on the coil around the side, and stuck down the 4 pin coil contacts based on the above measurement.
After you take out the screw by the buttons, the retainer bar and buttons can fall out. I recommend you just explicitly remove the button retained and buttons, so they don’t fall out unexpectedly.
I second the method of getting the back off by inserting an appropriate shaft through the hole just inside the sim slot. I had zero success using suction cups or trying to get something into the edge at the bottom, but very easily pushed on the back from the sim slot hole enough to get a plastic spreader in. The YouTube video by David Lee shows this.