OK, well maybe not EVERYTHING (you still need to make sure it’s going the right way), though it is extremely important when you are highly leveraged.
Since I’ve started working with real money I’ve lost money 
Luckily it hasn’t been a lot (I’m currently down by 1.44%). The main reason for my losses has been through bad timing and not having the balls to stick by my position when it is going the wrong way. In all cases where I’ve lost money I was right in my prediction, just out on the timing (I still have one small position I opened 8 days ago which is just starting to come good).