..continued from the previous comment:

Of course you have take to the common sense precautions when dealing with a high capacity Li-Ion, if you don’t know what these are than you should not be repairing MacBooks in any event.

I just replace my battery (mid 2012 retina A1398) and like many readers I decidedinstead of disassembling pretty much the entire computer went straight of the battery. I used a 20g solid copper wire to pull under the battery elements with minimum application of the solvent, the computer slightly titled away from the logic board. 10 minutes to remove the old battery complete;y and than another two hours to clean out the adhesive residue ! (the latter part would have been the same even if I did a complete disassembly as suggested by the guide). I think that disassembling a MacbookPro as suggested by this guide has a high potential of damaging gentle connectors and in general getting things wrong, loosing screws etc.. - and some of the comments confirm it. So my advice - don’t follow the guide beyond the opening the bottom cover and disconnecting the battery. Just go directly for the battery removal - it is faster, easier, and has less potential for damaging your computer.

I think that in “Mop up any remaining adhesive remover and give your MacBook Pro a few minutes to air dry.” - the “mop up part is a major understatament.

This is by FAR the most laborious, messy, and time consuming step in the whole affair.. Of course it does not have to be done perfect but..