The actual learning to fly a gyro is not so hard for an ex fixed wing pilot.... what is the thing that usually brings ex fixed wingers undone, is unlearning fixed wing reactions when things begin to go wrong.... because using fixed wing reaction in a gyro will generally end in tears. In a gyro, following terrain with the stick, like pushing the stick forward to descend has to be unlearned....
Also, even tho the joystick and rudder pedals appear the same as in a fixed wing.... knowing the difference and applying the right technique in the right craft at the right time is key. Many fixed wing pilots in a gyro on takeoff have forgotten that the stick is for speed, not climb on a gyro.... they see the trees at the end of the strip coming up and keep pulling back on the stick to try to climb over them.... whereas easing the stick forward will allow the gyro to gain speed and climb over the obstacle
That, and landing too fast..... doing a plank landing in a gyro can cause upsets as well.
Gyros and planes are like cars and fork lifts.... as long as the 'driver' can see the differences between a car and a forklift, they can drive either.... they both have a steering wheel, forward and reverse.... a steering wheel a brake pedal and gas pedal.... but you cant drive a car using fork lift technique and you cant drive a forklift the same as a car.... the subtle differences need respecting.
Elwood can probably explain the differences.... he is a gyro pilot who has just learned to fly a plank....