I think our “enoughs” are very personal and depend a lot on the confidence we have in our skillset, our support network and who we have to care for. Depending on work for a residential permit if applicable would also enter the picture and make things more stressful.
As a single without dependents, I can have fairly low enoughs. Having a high trust in my skillset, that helps too.
One thing that helps me too is to differenciate my expenses when I’m working to those when I’m not. My expenses when not working are significantly lower than when I work (I do cook, use my car less and have less stress expenses).
I’ve started with a negative net worth and less money in my bank account than would take me through the month. To me, the first step of enough is “liquidity”: I have enough money in my bank account that I can afford to pay my bills until next salary comes in. To me, that is CHF 1000 that remain before the next salary comes in.
Then, there is "I can bridge the few months it takes to get outside help (for example unemployment). That came after 1 full year of work and 3 months of expenses in disposable liquid assets.
There has been the “I take liberties in my work and will do things my way, confident my results will shield me, no matter if my boss wants me to do them differently”. That level wasn’t monetary, I think it comes with work and life experience. I’ve reached it with the current job I’m leaving, so about 1.5 years ago.
I guess your step 1 would be my “I’m confident enough to start my own venture.”, for which I’m giving myself 1 year, so, to me, it comes at 1 year of expenses + all of the specific business expenses I would have (insurances, software, hardware,…) minus the income I expect I can reliably get during that time (for example unemployment, provided I am willing to take another job if I find one while doing my searches). The more I have stashed aside, the longer I can afford to pursue my own venture before having to capitulate if it doesn’t pan out and the more picky I can be about taking another job if I find one.
The “choice” step would probably be my “light FIRE”, which I take as enough assets to cover living at the poverty threshold which is currently slightly below 30k for a single person (which would mean CHF 750k in assets with a SWR of 4%). I’m confident I can live and expand my network and skillset at that level, so that I can make my starting situation good enough for me and my future situation better.
Coast FIRE, for me, comes with assets allowing for a SWR of 4%.
Full FI comes when my assets allow for a SWR of π%, just because I like the number and it’s between 3% and 3.5%.
Edit: to summarize:
- Liquidity: CHF 1000.
- Changing job as a “crisis” I can confidently handle: 3 months of expenses.
- Changing job as no crisis at all or starting my own venture: 1 year of expenses.
- Working as a choice: CHF 750k.
- Coast FIRE: assets allowing for 4% SWR.
- Full FI: assets allowing for π% SWR.