From what I have read, many people who have sold have come to regret it. That said, I have no experience day-trading and would refer you to those with more experience in the nuances of generating profit on bitcoin exchanges

I suppose one healthy method would be to reimburse yourself for any initial expenses, and select an appropriate percentage to convert to your currency of choice so that you have a sense of security, while keeping some assets within the bitcoin system such that your portfolio can continue to grow.