I would direct you first to this great post on this subreddit: https://redd.it/7k9fbv
The guide I used was: https://www.youtube.com/watch?v=SKO66ecOcro
Battery: https://www.amazon.com/gp/product/B013RLJMHA/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
Rather than purchasing the OEM replacement adhesive, I got this 2 mm thick double-sided tape on Amazon: https://www.amazon.com/Eco-Fused-Adhesive-Sticker-Phone-Repair/dp/B00BXYWXY8/ref=sr_1_3?ie=UTF8&qid=1515534755&sr=8-3&keywords=2mm+double+sided+tape