For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
You can rip out the old one, then remove all the rivets and use screws to put in the new one. But at 65 that is pretty cheap for a complete topcase with battery.
Also A1286 from 2012 is not a Retina. A1398 is the retina