I completely dissagree.
Get very comfortable with your trainer and I don't think you will have any problem handling the decathlon.
Get used to landing the trainer with a bit of speed and practice a longer roll out building speed on the ground before taking off.
The only real problems will be ground handling compared to your trainer. It has to have enough speed before taking off and can't be floated in like a trainer. In the air it will not self level like your trainer but will fly where you aim it.