With FIRE I feel like people are thinking far too big which makes long term planning feel futile.
Ideally you want to be making goals per year based on your interest: Will my interest pay off my spotify subscription, then will my interest pay off my spotify subscription and my phone contract etc. Eventually leading to water bills, gas and electric or even your mortgage repayments (but that's unlikely).
The goal shouldn't be to fully retire, but for basic expenses to be paid which makes you relatively self sufficient and means that you get more out of your money per year. Once your housing/car payments are fully self sufficient, even a minimum wage job means every penny of it is now only being used for food and play (or investing), at which point you can transition towards a 'hobby' based career until you feel like you have a comfortable level of savings.