Signs definitely follow ONCE you are in your state of your wish fulfilled - they do not precede. Also, this letting go thing is misunderstood; you don't have to let go of the desire, but actually you should be attached to already having the desire. You should not be attached to the lack of or how the desire will unfold. If you are sitting there trying to let go, you are not doing it right. Enough imaginal sessions will cause you to naturally let go, or impress the belief so you feel as though you already have it.
Tbh, I only follow Neville, and Agnes, although she means well, isn't consistent in what she teaches. Trying a million different techniques and not seeing results clearly isn't working, so I would stick with one scene and do that until you don't feel the need to do anymore. After that, don't sit and wait to see signs, just live in the assumption.