It is an adjustment, for sure. I've been FIREd for a year, though residual income from that employment didn't finish until mid-May 2018. So I'm at 10 months with no employment income.
A little over two years before I left work I asked some smart people I knew to look over my plan and give their opinion on whether it would work. One of the things we did was go year-by-year for the next 20 years and identify where my living money would come from. I had a theoretical drawdown strategy, but watching the actual accounts be reduced each year (even on paper) was painful. I learned that I was not yet ready to do that for real, but I had 2 years to prepare.
So I knew it was coming, and planned for it. I had a bit of ready cash in the bank, but I've had to make two withdrawals from my investment accounts so far. The first one was still tough, the second was easier.
It definitely helps to look at the whole picture, not just what is in your bank account. Your bank account may be dwindling, but that is because none of your income is being auto-deposited there. (Though maybe it should be: I've changed the dividends in my non-retirement investment account from automatic reinvestment to paying out, so it's like getting a paycheck once per quarter.) Seeing the investment account increase even while I'm pulling from it helps a lot.