I'm also in the first year of retirement. Before I left, I started directing my savings straight into the bank account instead of other investments. I saved up about 6 months of living expenses in cash. Since then, I've done one sale of ESPP stocks (last month) that will carry us another 5-6 months. I have another asset lined up to sell for the next period we need some money in our bank account to pay bills later this year.
So, I don't (yet) have any precise withdrawal schedule, I'm just liquidating assets according to tax treatment/risk/personal preference. For example, I sold the ESPP stocks because they were the highest risk (one company's stock), and they appreciated a huge amount since I purchased them years ago, so selling them now while I have $0 earned income will allow me to avoid paying any capital gains taxes.
Next year, I'll likely sell a rental home and the equity there will carry us for about 4 years, then some mutual funds/etc., then I'll be old enough to start taking pension and 401k withdrawals, then SS...
It was indeed weird to see the automatic deposits finally cease going into my bank account from my paychecks, a little unnerving even though it was completely anticipated!