Tip: If you make a change to your ROM that you regret, just go to File > Restore > Restore ROM to Previous State in the menu. From there, you can select a restore point and revert your ROM to a previous state.
Small update 2022/03/29
I've clarified some terms in the readme with regards to updating the hack.
I've also made some small changes to stages 1-3 and 1-5 to make attaining 100% in those stages a bit easier/more fair.
Note that these changes aren't currently reflected in the master branch of the github.