After just one day of use my hand feels very tired. Someone recommended holding it in my lap and doing it that way feels very comfortable, but on my desk feels much more stressful on my wrist and hand than a normal mouse. Maybe there is a better way to use it than I am now. What is the best position to use it? Wrist flat on desk? Use a wrist pad? What do you do with the fingers that aren't in use? Curl them under like in the Apple videos?