1) Network. By this I don't mean hand out business cards to everyone you meet and pretend to be interested until you find out they "can't help you". I mean be genuine, friendly, share your experiences with others. Listen when others share their experiences with you. Basically, be "out there" but don't be a jerk. You'd think this wouldn't require an explanation, but from what I've seen, it does.
2) Work for people you can trust. I try to work for people who, while they may not pay top dollar or you may work more than you'd like, or whatever, their word is their bond and they take care of their people. This has yet to prove to be a bad decision... I have not had one job that I'm sorry I had (in aviation, anyway).
3) No matter who you're talking to, always (on duty, at least) comport yourself as you would want a potential employer to see you. You never know who is watching or who knows someone you're talking to.
4) Never, never, never talk crap about your job. If it's that bad, quit, then talk crap. Certainly don't do it in an interview. If they want a "TMAAT you had a conflict with a co-worker", make it a light one and make it with someone at or beneath your paygrade. Maybe you were totally in the right, maybe your boss is Lucifer come again, but no one wants to hire someone whose first thought is "my boss/job sucks".
Other than that, just keep your nose to the grindstone, plug away, try to provide the best service you can to your clients, whoever they are. If you work hard, it will eventually pay off.