You don't "do" you just "are". You can't change the dominance of your hands but you can improve your handwriting. So if you want to be left handed, just work on using it. You can't become left handed but you can certainly be ambidextrous!
she is left handed
he his left handed
he is left handed....
Left handed
Left handed
Shane Dawson is left handed,,,And so am i :)
left handed
LEFT-HANDED! not right-handed!
He is right handed.
There is a 26% chance that the child of two left-handed parents will be left-handed.
Left handed
Left handed.