Finally, a word about expectations. If you hope for the best but do not expect a specific reaction, you will probably be better positioned to respond to whatever happens. People often remark that they were not surprised or that they knew all along. Whether you receive affirmation or silence, it is best not to look to your coworkers or manager for the acceptance that you may never have granted to yourself. So, remember that you are providing important information about you, and that this is potentially an opportunity to educate someone who may never have met someone who is GLBT (that they know of!) One point is clear: They certainly have never met anyone just like you, and now they have the opportunity to know you more fully.
If you have read this and still can't imagine coming out where you work currently, then perhaps you're just not ready yet. A book titled "OUT In The Workplace" (edited by Richard A. Rasi and Lourdes Rodriquez-Nogues) may be helpful because it describes "the pleasures and perils of coming out on the job." Or, you may need to change employers before you begin working out. In the meantime, you can still develop your on-the-job performance and seek out supporters. Good luck!