So basically you will go to whisky and he will give you a special training regime. You will constantly do this regime until you can control your kind. Once done you get first either attack or defense ultra instinct depending on your class like physical or martial arts when you are some how exposed to a high amount of ki at one time. You will slowly master the other forms byou going back into the former by being exposed to similar energy saving at low health. At one point you will have both sides and go into it at will