In MY experience:
You do not work towards anything. Anyway, nobody can tell you what that "any lengths" looks like. The "any ways" are stuff that you might even not be able to imagine right now. You become more willing throughout the process, or you'll know it if you are not willing. I found out I was not 100% willing somewhere after the first half year. How? Simply because I wasn't doing everything the book asked me to do. You do the work. You notice that you get into trouble in one way or another. You start working harder. And then it works (at least, for me)."And if you don't feel 100% that you'll "go to any length"? How do you work towards that? "
Also, having a sponsor is fine, surely, but your sponsor is not responsible for you not drinking. Hence, you don't need a sponsor per se. If you are a real alcoholic, the big book tells you all you need to do. If you do these things, the book promises, you will be sober and even happy. If you don't,you won't. No sponsor can change that. If someone would ask me with the expectation that I can get them sober, I would explain to them it doesn't work like that.
You get conscious contact with God through the steps. God does the rest. Not you, and not your sponsor.