Which chromebook do you have and what are its specs? I'm interested in doing the same, and I don't want to spend $800+ for a laptop I'm not going to be super happy with.
Nick Janetakis had a nice write-up on setting it up from back when the machine was newer, but to give you an idea:
https://nickjanetakis.com/blog/transform-a-toshiba-chromeboo...
Look for a Chromebook that you can unlock by just removing the battery. Anything else is just torture.