I am second to the documentation problem too. And even just SDK installation, it took me more than 5 minutes to find the URL of Nokia closed binary EULA site (which on the other hand, Android and iPhone do much better job).

It is also hard to find a specific problem, such as, 'How do I put an icon for my application' or 'How do you trigger camera AF setting'?

In the end, I have to go back reverse engineering routine.