Okay, I admit it. I can’t spell practise / practice.

Do I practiSe the piano and practiCe law??? Or is it the other way round?

Its embarrassing but I cannot get my tiny mind to remember, no matter what I do. My brain is full of other more important things. But can someone help me out? What is the correct spelling and how can I remember it (you are dealing here with a person who still has to reciteĀ ‘Naughty Elephants Squirt Water’ when deciding which way to get on the motorway)??