I think you just have to keep at it - you sound close. I've been trying for about two months (3-4 nights a week).

Initially I got just the HI. After a few times I began to hear the sounds. Sometimes the sounds appear as though they're from the room (my wife talking to me for example). Most of the times the first sounds are some loud crash or clap of thunder. This gave me the most problem because it often jolted me awake. After about a month I could get past the sounds most times and get to the vibrations. A couple of times I got to this point, but couldn't get myself into a dream before what seem like a long time, so I opened my eyes. Two nights ago I had my first successful WILD. I heard my wife's voice and bells ringing. I made the HI into bells (I can also often see HI of what I want). I concentrated on relaxing, staying conscious, and getting into the dream, which I did in a relatively short time. Unfortunately, just after landing in some laboratory I could hear/ feel my wife turning over in bed and this awoke me.

Point is, you're lucky if you try WILD once and it works. For me it has so far been a gradual progression, which hopefully will continue to frequent LD's.