If you're concerned with safety of principal...you shouldn't be trading at all. --
just invest in the broad market, S&P 500. Buy n Hold it.
To make trading worthwhile, you have to be really 100% gung-ho or nothing at all.
For the individual trader, you should aim to at least at the bare minimum double the performance of the market index.
If that seems too lofty or aggressive for you...just invest in the SPY, and don't waste your time and energies staring and analyzing the market everyday, or weekly. You're putting in and dedicating a whole lot of time for not that much added benefit at all, if anything.
Years pass by, even decades...and you have gained nothing at all.
And you would have wished you would just invest in the SPY and spend your time with quality life endeavors.
Constantly chasing the dream...like American Idol contestants who are convinced they have serious talent to create music CD's and sellout stadiums of fans.
Make Trading Great Again 2018

....Hopefully, this will finally be your year...to become a SuperTrader.