All my life I had problems with Left and Right - my mum had to write 'L' and 'R' on my hands for my cycling proficiency test - and it was a pain when learning to fly, 'cos the intructor would say one thing and I'd do the other.
I got annoyed about it, realised I really *had* to get to grips with it, and I did. Perhaps it was because my brain was set up in 'learn' mode, but for the last 2 years I've not had any problem with it. Nowadays, left and right instructions just roll off the tongue like a normal person.
Steve R