I'm an elderly retired geotechnical engineer, pursuing a hobby of swing trading in my Roth and IRA accounts. I don't take large positions in order to limit losses, selling as soon as I see $200-300 net gain, regardless of higher potential. I studiously avoid any greed tendency and am quite content with only the satisfaction of attaining my net goals. I have averaged a net gain of about $1000 a month over the last two years, which is quite satisfactory as I have minimal need of more ( but it would be nice!). The only judgement errors of significance have been some numerous holdings of mining stocks that I bought in the mistaken anticipation of inflation increase, which I am sure will be here soon.