I think education is very important. People ask me all the time about crypto currency and then I see their eyes glaze over when I start explaining it. You need to know what you're doing and how to do it.
The other thing is that you need to take emotion out of it. I'm always amazed at how people sell when everyone else is selling. Even if it is your intention to sell, that is the absolute worst time. My cousin freaked out when XRP took a dive and sold it all at the absolute bottom. If he had even waited a week, he would have seem some recovery. Interestingly, at the top, he was all, "Gonna let it ride no matter what. Don't care if it goes to zero."