Excellent guide. I'm a repair technician who works on both PCs and Macs. This was my first rMBP battery replacement and I wasn't sure what to expect. For those experienced with electronics repairs, I'd say this is a relatively easy repair with the exception of releasing the adhesive which holds the battery cells to the case. I was eventually able to do it with a spudger and some elbow grease, but I was worried at times that I was going to puncture the battery. Apple really needs to dial back the strength of adhesive they use for these applications. They are clearly making it as difficult as possible for the average user to attempt, which IMO may end up costing them well informed and thoughtful customers. This setup is similar to the iPhone 6 battery (which I actually did puncture with a spudger the first time I removed one) albeit more involved to remove. In the case of the iPhone, a few minutes on the hot plate loosens it right up but this isn't really feasible in the case of the rMBP.