'Be careful with all kind of market' - sounds a bit better :)
Yes, there is no certainty, it’s all about probability! Anytime market can change its direction.
Exactly sideways market can change into raging market during seconds!
Somewhere here on MFB I read that user do not use stop loss as they are not needed as trades last couple of minutes.
That is pure nonsense, in forex anything could happen and it could happen very fast.