How can you tell whether your job targets are realistic?

The only way you can tell for certain is to go through the basic steps of your job search and see how far you get. If you find yourself running into a brick wall early on - that is, you have absolutely no luck uncovering job leads through the Internet, networking, the classifieds, or recruiters - it's a safe bet that your personal goals are out of sync with the realities of the marketplace, in which case you may have to scale down or rethink your targets.