Here are a few articles that may be of interest:
Employees who receive long-term incentive compensation in the form of corporate equity benefits - such as RSUs, ESPPs, and options - may find themselves accumulating more shares than they know what to do with, or feel baffled by how to plan for the tax liability. Because of this, you may be hesitant to either exercise your options or sell your shares. Here I will lay out some foundational information you need to develop a framework for handling your corporate stock shares.