Withdrawing money hasn't kept me awake at night. By now, with SS and pension and equal monthly distributions/RMDs from my TSP "G Fund", I don't have to withdraw any more spending money in order to live at my preferred standard of living.
BUT - - most of my investments are in taxable accounts, and what is hard for me is incurring capital gains when selling holdings from these taxable accounts. I am loathe to do this because I dread the tax hit the next year, and haven't been rebalancing as often as planned.
Consequently my AA has shifted from 45:55 (equities:fixed) to 50:50 during the past year.
I do not recommend this for others!
Rebalance according to your financial plan.