What I mean, with be obsessed not losing money is why most aspiring traders fail, is jumping out to quickly out of winning trades. And letting losing trades run in the hope that it turns around. So be obsessed not losing money!! If it is a losing trade than it is a losing trade, than it is a lost, close it and not needed to lose money.
I used to work for an investment bank, and in 2014 when a person had lost x of %'s of the equity or took to much risk. That person would need to bring coffee around for 1-3 months.