I used to be index floor trader in Amsterdam about 25 years ago not that that was a real succes. I later become on of floor trader in options and futures trading mostly on feel and some charts. That went initially well untill I lost my touch. Ten years in the financial world I switched to option arbitraging by being a kind of market maker in options quoting one side markets in the DIA in about 20 to 30 series of the first two months. I used an option model that I had programmed in Visual Basic into Excel and kept track with that of my positions and my Greeks keeping things neutral as much as possible I was basicly buying options below theoretical price as I saw it and selling them above theoreticcal price. I had a way of adjusting my guestimate of vol with skew along the series. This was incredibly profitable: I guestimate over 90% of my trades were profitable and I made 500 to over 1000 USD a day. Losing days were no more than 2 a month and even then it was something like 50 USD (this only happened on days when vol used to move in a spectacular way. However that too came to an end when Interactivebrokers started to charge for options cancellations. I used to send about 1000 quotes to the market and of them about 800 were cancellations/price adjustments.
In 2007 I started to trade eurusd...and turned my trading eurusd into some kind of hobby. I finally seem to have made some breakthrougs in understanding price action so let's put this a bit to the test in my journal