Stop loss is MUST

But it is not enough to keep in control of your budget.

Successful trading requires complex risk management with several risk limits (like overall drawdown, losing trades in a row and so on)
Also, it's about psychology. The idea is not to move your stop and to comply absolutely with your strategy.
Personally, for me the software related to risk management is useful (i use https://www.bitinsure.com/, idk about other similar)

It controls my risks (drawdown, losses and other trading limits and sends me alerts when any of them is reached. Also it gathers and calculates real-time stats so I do not spend any time on monitoring my accounts, looking of drawdown and other risks and have my performance stats at hand