I was once talking to someone about a new technology that reduced a project cost from $100k to $10k. The person asked me "you're a consultant, don't you want the $100k project?" I replied "sometimes, the difference between the $100k project and the $10k project is $90k. Sometimes, it's $10k." You see, if the client can't afford a $100k project, I won't get the gig. But if they can afford my $10k gig, I will get it. Wishing for (or trying to angle or scheme for) the big payday may leave me with nothing at all, and I might have preferred the small payday. The same thing applies to you.
You're worrying "how can I make sure they offer me $x not $y, how can I negotiate to get at least $x" while you're making ZERO right now. As you say, you don't have experience, and you clearly know that experience is a big advantage. If you land the job, you will have income (as much as you want? Maybe, maybe not) and will be gaining experience. You will become more valuable every day as you prove yourself to be good at what you do, and as you learn on the job. Plus you will be getting money. Every day that you are unemployed you become less valuable because people worry there is something wrong with you.
Focus on getting the job. Do not risk the job trying to win the negotiation. Most companies aren't trying to hire people for half what they're worth - they know such people just leave as soon as they have experience. In the market you describe, if you try to demand a salary more than they want, they can just move on to the next great candidate in line. The only way to improve your leverage is to gain experience. That, more than money, is what these people are offering you. Listen carefully in the interview. If you take this job, and do it well for a year, will you be worth more in the job market a year from now? If so, taking the job is winning the negotiation no matter what salary they offer.
If they are willing to offer you the one thing you need most, don't risk it by demanding they also offer you more money than they appear to want to. If it turns out you are wildly underpaid, you can look at trying to get a new job later, when you have some experience and are more valuable.
This advice doesn't always apply; when jobs are not so thin on the ground, when the jobseeker hasn't spent 18 months seeking without success, I would suggest something different. But in the situation you're in, what you need is a job, not to fuss about whether your sundae has a cherry on the top of it or not.