Pen names can be a trouble,especially when introducing yourself to people. You can't use your pen name unless you get it legalise by the state or country you are from. Best to talk to a lawyer, mine suggest use the name as a business name,so I can use the name on contracts or sign for it using my real name. Its beats changing it. If that fails or doesn't work for you, let your clients know that its your pen name you are using . Don't worry they won't take it that hard as many persons use it like JD Robb- Nora Roberts. Hope that helps.