My best advice would be; save all you can, get all of your debt cleaned up, then do a detailed budget to try and figure out what your spending will be.
I walked away from work about 3.5 years ago at 57. We are debt free and lived debt free for probably the final 10-15 years of my career. Maxed the 401k for many years and also bought real estate (farms) that generate annual income, as well as invested pretty heavily in a small local business where I now sit on the board and get some income from without having to go to work daily. Was self employed, so get a pretty good chunk selling the business also.
Insurance is a big deal if you are under Medicare age. We (spouse and myself) pay approx. $18,000 annually for ACA health insurance coverage that is so-so insurance with a high deductible and no dental or vision.
Toughest thing for me was trying to figure out my "burn rate" or how much money we spent annually as we were relatively high income and just spent what we needed to do what we want. I built a big Excel spreadsheet and did my best to calculate our annual spending and actually got pretty close first attempt. Shared some of this with my CPA and he said I was the only one he ever saw with line items in their budget for hunting and fishing. Several years in, we now no how much $$ we actually have to work with, what annual income will be coming in and approx. how much we spend, so we've gained a level of comfort.
The stock market and has been pretty wonderful last few years. Rolled the 401k into mutual fund type investments, have been drawing $48k annually and the principal is 20% higher now than when we started using it 3.5 years ago. I'm sure we'll see a downturn at some point. Holding off on drawing social security for a while to get the higher returns.