Having been there numerous times (7 fertility treatments, 5 fail and 2 success) I can honestly say that I don't think attitude has any impact. I had cycles with great attitudes that didn't work and worked, and the same for cycles where I felt totally resigned and barely made an effort but then was surprised by a positive.
You can be positive, negative, busy, rested, none of it matters. If it is going to implant it will, regardless. So, don't kick yourself for a bad attitude. It's so hard.