I would put 4 before 3 and before both I would check existing tests and maybe add more. Also, just start the refactor because it will help to break analysis pa

I would put 4 before 3 and before both I would check existing tests and maybe add more. Also, just start the refactor because it will help to break analysis paralysis. Just edit the damn code. After some time maybe you will need to throw everything away and maybe start again, but with better understanding of the code.