There are issues with execution since liquidity is low these days. You have to find a broker with good execution algos and dark pool penetration. Diversification is a must to reduce equity variability. Trading simultaneous long and short positions in market neutral mode reduces exposure to market risks. Most large AUM funds trade long and short with fundamental or technical signals. There is a good introduction
in this article of an expert I follow.
I am very spotty now on abilities to program, one too many brain procedures messed that up. So through the years been hiring very bright college students who care more about how to pay rent than whatever they doing for me, and besides none get the full systems, just parts and I can fully understand the programming after done. So past 8 years, been able to a number of ways to get orders filled without showing my hand-not that I am pulling that size that anyone would ever notice. But trading for me always been about the game, how to become more secretive of just plain hiding, it has become very fun to then automate my concepts. I been this way all though my life, I really don't know why nor know why I must never quit no matter how many failures within a project and always keep working till it is solved. I do know "trying" to accomplish, much more is gained throughout life than sitting on the couch, and failures
are opportunities to try again differently, and a few times failures are very very rewarding. I often wonder if our brain senses patterns within patterns when we are trying to discover an area we are not expert level as yet. I often think we do not think before backtesting of enough questions to ask of the data.
I use to think I knew years ago that diversification was a way to reduce overall risk, but we all have to come down to reality. I don't think it is possible of remaining a one man team and attaining one billion dollar account trading. For me it is all about hedging, if I can't hedge it, I am not buying it, same goes with selling short. I don't understand why so few people do not hedge or perhaps they are secretive about it, and that is fine. I have never done the math on "how much" in theory one could buy of perhaps GE or Apple and be able to hedge without wide spreads. Hedge funds certainly don't advertise how many stocks they have in portfolios, but often wondered, by trading less number of different companies be able to continue hedging principles, and hedging does not have to be done only by options, but biggest problem always is liquidation.
Doing couple hundred options on most heavier stocks is eaten away, just wonder how 10,000 options are exited without giving up mucho.