If I can build games, anyone can! Honestly, if you have a basic knowledge of game development you can use GapiDraw. The supplied samples will help you get started, and you can even find source for a couple mobile games on the Pocket PC Studios website. There are a few other source code examples out there as well (I really need to make those available on my website as well, so if you have source for completed games you would like to make available, please do contact me).
This forum is also a great place to get help on GapiDraw and both basic and advanced game development questions.