Do you have the shifters that have the thumb button? If so, you can just remember "Thumb=Tough." That is for the right hand where most of your shifting will be done. Just the opposite for the left hand. Or you can remember that the thumb pushes the chain right the lever pushes it left. And on the left hand the lever pushes the chain right and the thumb pushes it left (the same directions you are pushing the levers/thumb button. Remember, chain towards bike is easier, chain away from bike is tougher. Or chain to the left is easier, chain to the right is tougher.
As we must account for every idle word, so must we account for every idle silence." ~Benjamin Franklin