I do it, its not to hard for me, but i kinda have wide feet. For the most part its so you dont drag the tires when you are slowing down or going into a corner... Didnt take me too long to learn, just pay attention to where the rpms are when you downshift and you will eventually just be able to goose it just enough between gear changes to get it to where you cant even feel the downshift. I like doing it, everyone that is around me thinks im trying to race them. Espescially in the loud ass winter car(audi 4k).
i have pedals on mine - or else my size 14 slips off the clutch (i have large legs which dont allow my clutch leg to hit the clutch pedal straight on). i cant fit my feet in there for true heel/toeing, but i can roll it - the ball of my right big toe on the brake and smaller toes/outstep on the gas. works for the most part, though different shoes throw me off.