Since late 2012 Keyboards on Apple Laptops are not easy to remove anymore, that is the reason why you don’t find a good guide because to do a clean and good job you have to replace the entire middle frame/housing for a new one with keyboard included.
Now if you have time and you want to save money you can remove the keyboard and install a new one. [https://www.youtube.com/watch?v=iXJBAlM32NY|Youtube Tutorial] in the minute 30 and up you can see how the keyboard is attached to the middle frame, if you want a solid job you have to be creative.