I still struggled with telling left from right well into my teens & I think it was still a problem when I was learning to drive!
My mum always thought it was because people had frequently told me my right hand was the one I wrote with - it's not, I'm left handed! But now I know it's because of the dyspraxia. I know even when I thought, "my left hand is the one I write with" I could never visuallise which hand I would pick up a pen with unless I had pen and paper to try it out.
I was later told about the, hold your hands up flat infront of you, (fingers pointing to the sky, thumbs towards each other) and the hand that forms an "L" is the Left hand. Except I would look at them and still not be able to tell which L was the right way round!!!
I do now know fairly instinctively which is left and right, but I still frequently lay the cutlery on the table the wrong way round!