re: Confused as hell on exemptions/witholding on taxes. Please help.

Changing jobs multiple times during the year can result in severe under-withholding. Each employer is likely to withhold as if you had zero income when they started paying you. Thus, some of the withholding from the later employers will be based on the 10% tax bracket even though you may have exceeded the income from prior employment. And the last dollar you earn may not be subjected to withholding at your actual marginal tax rate.

You need to sit down and fill out a W-4 using the worksheets on page 2. You may have to submit W-4's with zero withholding allowances and additional amounts withheld in order to avoid a large balance due on April 15, 2014 and possible penalties for insufficient withholding.