I learned to drive 40 some years ago in a manual in the hilliest town in a northern state that was basically nothing but one way streets. Not only can I drive on hills in the snow, I can parallel park on either side. I still drive a stick and really don’t like driving the wife’s automatic. I was doing research in Namibia and my vehicle there was a right hand drive manual - the gear pattern and the pedal layout is the same as here, but obviously you shift with the left hand. Took a while to get used to. Really made it awkward to downshift and use the turn signal at the same time, something I’d always done and never realized.
My biggest issue with right hand drive here in The UK after 20+ years driving in the US, is that it just feels wrong to look to the left for the rear view mirror. That, and being in a hurry, jumping in the car without thinking and realizing the steering wheel isn’t there...damn, get out and walk around to the other side and hope nobody noticed.