The Virtues Project (www.virtuesproject.com) provides the following guidelines for setting boundaries:
The key with boundary setting is to start with baby steps. Also to practice with safe people whose relationship with you will be able to handle a boundary discussion.
Choose one work area from those described earlier - clients, colleagues, employers or self and identify an area you would like to shore up a boundary in. Choose something that you could address in the next day or two, and something that feels safe and manageable.
Some examples might be:
In your workbook write down the specifics of what issue you want to set a new boundary around. Be detailed about what outcome you want from this new boundary - e.g. to not have home time interrupted by work phone calls.