I bought into a mutual fund from an FA friend but am considering changing to my own passive ETF investing. Should I wait for a good time to sell it or cash out asap, because of the fees?

Best decision ever (I guess) if you'd name the Mutual Fund on this thread (or you'd open a new question on this board) I could give you a quick analysis and mention ETF alternatives.

bye bye​​​

Depends on what mutual fund you are holding now and what ETF(s) you want to invest in. If one of the ETFs happens to be the benchmark that the mutual fund is paired with, and is outperforming it, why not keep it since the fund manager is doing a good job at the moment. As the mutual fund moves higher, just tightened your risk tolerance and cash out at a profit if things turn south.