holy crap. it was tedious but watching the videos to start with and then reading through the guide while doing the actual repair got me through it. My first problem was breaking the 2nd adhesive strip. Had to heat it the phone and then use a flat card (with no numbers engraved). i did bend the battery (no rupture) so I should have been more patient. A side to side motion with the card worked best for me. you can also put the card in at an angle using a corner as long as you’re careful.

The second problem I had was bending the battery connector in the same way that the original came to make sure it fit in. It takes some trial and error. Do NOT crease the cable.

Patience friends! good luck!