Creating a style from scratch using Yamaha's built-in Style Creator program is not at all difficult. It takes a bit of time, some creativity, and when you think you're finished--you're not. It will likely need some fine tuning and a bit of tweaking, but when the final product reaches the completion stage you'll be a happy camper, and the creating each subsequent style will be much easier.
Squeak echoed what I've been saying for many years on this and other forums. Only a small percentage of arranger keyboard players and owners ever scratch the surface of their arrangers capabilities.
Cheers,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)