Every individual has his or her own types of challenges, in using the LOA. And as the individual grows, the challenges evolve and change too.
Intuitively, my sense is that your challenge, Bmlyeryk, is that you're too volatile. Time and again, if your intentions do not manifest, the reason will be that you sabotaged yourself because you didn't hold on to the necessary thoughts long enough.
It's like this. You want X. If you simply held the right thoughts long enough, X would have arrived in your reality. But you grow impatient, you lose focus, you moan about why didn't it happen within 2 days, or by yesterday, nor this afternoon, or immediately, etc etc ... and since your focus is now on why didn't it happen, well, of course it does not happen.