Some background and my 2 cents based on personal experience.
I have been managing money for others starting in 2008-9 when a few acquaintances asked me to in a similar manner. By then I have been managing my own money for several years. In 2011 I transitioned all clients into a fund and not accepting separate portfolios to manage. It is much easier and simpler.
I would only manage money for people if it was as part of building a record for yourself as an investment professional. If it is just casual, don't do it. If someone wants me to manage his money and he is not a good fit for being a long term investor in the fund, I tell him to put all excess money into Berkshire (I do not trust indexing). I also tell him that after he does that he will become curious as to what exactly Berkshire is, so I also send him the link to the annual letters. Works wonders really with some people, but most just leave me alone and buy real estate or something.
Regarding managing money for friends and family, it can be a very good or a very bad idea. You have to spend some thought on how to manage the relationship.
Personally I recognise that with family it's different, so I do it on the condition they don't ask any questions other maybe once a year asking how much they have, and I also have their funds (my brother's and my grandmother's) on my own name in trust. With friends I treat them as normal clients - Annual report once a year, etc.
Anyone that asks too many non-constructive questions or behaves erratically, I fire. Meaning they get their money back. I do not deal with clients that get jumpy if the market drops 30%.
In April, I had one withdrawal that was not related to the downturn (a previously planned real estate transaction), and two clients added more. Almost nobody called to ask how the portfolio is doing. It's a long term game for most and they just don't care as they see performance as my problem to worry about and not theirs. As a result I have a relaxed experience and can get some results (we are up 50% YTD).
So it can be a pleasure or a nightmare depending primarily on you. If you do not manage client relationships properly it will end badly.