We have always budgeted by allocating for retirement, then for common expenses, then for individual expenses, then for individual savings. As soon as we're both retired (DW has been kind of slow in that respect), we'll eliminate the individual savings part of the budget. Mostly because we each have enough to cover ourselves with 4%/year of our current individual balances. Also, and we started this a few years before I retired, budget increases are now tied to CPI inflation, same as for Social Security, instead of W2 income. Starting early gives you a chance to try it out, keeps big late W2 income increases from increasing your budget and delaying your retirement, and funnels any extra income into your retirement funds.
Other than those minor changes, everything stays the same. I treat all assets as part of a single portfolio. I'll be withdrawing/Roth converting from my IRA first since I'm 5 years older than DW and my RMD's will always be higher than hers.