I was given access to their personal accounts, and made the investment decisions for those accounts. It was unpleasant because they did not/could not understand long-term investing strategies. I felt intense pressure to have my results be immediately successful. Also, I tried to impress them with "cute" decisions and bought things that I would have normally ignored. Over time, I did better than the S&P 500, especially after taking into account taxes, but it was not fun. Also, my friends wanted to talk about my investments, and it affected my decision-making. The good news is that I learned a lot from the experience, and if I ever wanted to do this full-time, I understand the parameters that I would put in place. PS, I still have access to the accounts and am asked to make decisions. I have shared all of the above thoughts with my friends, and respectfully decline to make any more decisions. If I ever do it again, the ground-rules will be very clear. Good luck.