What iI tell my customers new to ZTRs to do is use your off hand only to change speed and do all of the steering with your dominant hand.
This mwans you will be doing some wider turns, but you won't be spinning 360's on your lawn digging nice little duck ponds with your tyres.
After a while you will develop the required muscle memory and without thinking you will be doing two handed turns.
But if you try to "think" your turns you will end up replanting all of HER flower beds.