As others have said, just forget that your left leg exists! I first drove autos in Florida around 30 years ago and couldn’t wait to embrace them in the UK thereafter. Had a mix of autos and manuals for the next 10 years but over the past 20 years I’ve just had autos. I liken it to manual versus electric windows. You’d never want to go back to manually winding a window up and down! Good quality modern autos have better performance and economy than the manual versions and are so much nicer to drive. You never lose the knack of driving a manual though. I drive lots of different cars each year and many are manuals. I can jump into any car and be comfortable driving it within minutes. The sole exception was a LWB van recently when moving my daughter. The worst manual gearbox on earth!