I've called them before for that. TeePee is correct, It does totally depends on who picks up. A few of the crisis centers that answer the national hotline are trained in talking about alternatives to self harm, and keeping safe (the boystown hotline is one. Baton rouge crisis center is another), but others are totally stumped. One guy that answered the national hotline tried to tell me that they only talked tp people in suicidal crisis, and that I needed to stop being so attention - seeking. Before I hung up, I read the blurb on their website about calling for any emotional crisis to him. I didn't wait for a response, just told him I wasn't looking for attention, I was looking for help, and that he needed to rethink his job and ended the call.
In contrast, both the boystown hotline people and the baton rouge people talked to me about it, listened to the reasons behind it, and didn't let me hang up right away even when I panicked about it. No one from the national hotline has ever called the cops on me, but that happened with a local hotline before.