I think
knowing and
expecting are as important if not
more important.
Feelings and a positive mental attitude are good to supercharge the intention and as a general rule they help you get through the day, but it's the belief/expectation/knowing that is paramount. A true fundamental belief, that you know your intention will manifest is the key, feelings are important, but consistant focus is more important.
I've had better manifestations when my belief was strong and fundamental compared to just relying on emotion.
HTH
Jeff