Haven't nurturing this idea of trading a Bitcoin in the near future,but one question that's always come as a concern to me is. Is proper for me to trust a friend of that high magnitude ?
Friends can be trusted but not all friends should be trusted. A lot of close friends often cause huge losses, in this case you must be careful so that close friends don't do any damage to your wallet. I had a loss in life by one of my high profile trusted friends so I always used caution from friend circles afterwards. If you want to trade Bitcoin through your friend, you must be careful because if your friend is greedy then your friend will never treat you well. Also, keep your Bitcoin wallet safe from your friends at all times as it can be compromised by anyone at any time.
Trusted as companion but for money discussion I guess everything is questionable regarding in those matters. Money could reveal the true personality of people and their friendship might get broken towards that situation. So even if we trust our friends we should never let them handle our investment or trades. Since by doing that this maybe the starting point where a conflict will be created especially if there's misunderstanding on how they use or spend our money for those activities they have done.
Much better we trade on our own since we cannot step someone's ego and we can make sure that there's no further doubts on each result since we are the one trade for our selves. Remember money is root of evil so temptation is always there especially if there's huge money involve in the transaction.