Well difficult for those, who have skipped the learning part and started trading without any research. Those who come well prepared, will really enjoy this journey, provided they manage their risk well.
Losses and profits are a part and parcel of forex and so I think, one should take losses positively . Learn from your mistakes and try not doing the same in future, that can really help.
Yes, to some traders, forex may seem as difficult as a challenge. But this mostly happens with the ones that lag behind on the knowledge part according to me.