i don't improvise, it seems very hard, though it is one of the things i want to learn the most(but i have pieces to practice... no time i take lessons and im assigned piece for recital etc)
It's only as hard as you make it. You start with 'easier' stuff and gradually build the complexity and scope of what you are doing over time! The more advanced your technique is, the more your imagination can construct.The more your imagination grows, the more disgusting your technique becomes Do you have pitch recognition? And did you go far in music theory?
This etude is only easy to people who play it in 3/4. Group the RH in triplets.