I've been stuck on the first lesson (disc 3) for over a month now. I'm still horribly inconsistent. Some days I sound great, other days I break constantly and can't even do the warm up exercises (lip rolls etc) without frequent breaks. Some days I can go rather high up the scale with my chest voice alone before needing to switch to head voice, and other times I can't hit middle C with my chest voice and am forced to use my head voice from that point in the scale onwards.
I still can't do the tongue trills or nay nay nays either. I'm CAPABLE of tongue trilling, but my tongue seems to vibrate at a much higher rate than what is normal and I have to push a lot of air out really hard to actually get the trill going, which causes fatigue very quickly and often causes breaks.
As for the nay nay nays, they're just a mess. In order to reach the high notes with these I really have to reach and by the half way point every muscle in my neck is tensed. I don't know what I'm doing wrong but I know that's not supposed to happen.
I just don't know what to do to get around these issues. The inconsistency I assume will diminish with time and proper technique, but I really don't know what I'm doing wrong with the tongue trills and nay nay nays. It's very discouraging to go more than a month without any improvement.