There are many patterns that allow you to improvise and do things another way but Judy Niemeyer Quiltworx patterns are not among those. That is why she has certified instructors and certain patterns are only available when you take the class.
My first Niemeyer quilt was not nearly as complex as this one (Agave Garden) and I read through those instructions at least 4 times before making my first cut. Saved a lot of frustration!
Looks like you are on track now. But word to the wise is to not improvise on Quiltworx patterns.