I decided to use a simulator for practice drone manipulating.
I also use some mini-size quad copters so-called "Toy Drone", but frequent replacing batteries is bothersome.
I got a racing drone simulator software ($ 4.99 / about 555 yen), "FPV Freerider" . Transmitter is Futaba's T10J. I connected this to my MacBook with a simulator cable I bought from Amazon.
But how hard it is to control the aircraft with the simulator!
It is quite different from the drones I usually use for aerial photography and I cannot even hover normally. It took 2 days to get through the first gate.
I have gotten used to it little by little, but I don't know when it will be possible to turn the whole course.
I actually felt that what is called a drone is actually flying with a very delicate control.