Switching to whole milk

I’m a FTM and i was wondering if I can get some advice of switching babies to whole milk from formula. My pediatrician told me to start at 11 months slowly introducing my son to whole milk so by 1 year he can be on that only but I’m having a hard time with him. I read to mix a ounce or less into the formula milk but I was a bit hesitant about that because of thinking how it would taste, has anyone done that before? Any advice or recommendations would be super helpful!!