A formidable lady I worked for used to say, "Have the guts to ask!"
Once you know what you want, make it known to others.
Part of this is being prepared for any answer. If the thing we want is close to our heart, none of us want to hear we can't have it or that it's beyond our reach for now.

[Golden Bay - see more at Saundra's Flickr Photostream here]
It makes sense to test first when it comes to your career. When you know what is important to you, what you are good at and what you want for the future, you can define it for others. You know what to ask for.
You might not get the answer you want first time around but any answer you get can be learnt from. In every answer there will be something to help you move forward.
If you are unsure what to ask for, you can examine your experience and your values, talents and goals. When you are sure what you want, prepare yourself for every possible answer and go out and ask for it!
Follow these links for more on career decision-making and your values, talents and goals:
All the best for now,
Paul