How can I remember to use my left hand?

Ok, so I want to become ambidextrious ( spelled wrong, im sure) and I read that I should start off by doing little things with my left hand like brushing my teeth, eating or using cell phone. The problem is I can never remember to use my left for these things. What would you do to train yourselfto do this? In case anyone is wondering I'm doing this to improve my basketball game so any tips on improving my left for bball iswelcome also. thank you