I weigh myself every day. I know I'm not supposed to do that, but for me it's part of what keeps me motivated and focused.
I think it's okay to do so as long as the numbers on the scale don't dictate your mood for the moment. If I weigh myself and find that I've gained weight, (even though I know I've been an angel on my plan) I've at least learned to shrug it off and know that it's not permanent. On the other hand, if I weigh myself and I'm down, well then wooohooo it's happy time
I try to postpone stepping on the scale if I'm feeling fat/bloated. It's bad enough to
feel fat, but when the scale confirms that I've put on a few pounds, well....
However, if I'm feeling thin and weigh in a pound or two heavy then I just cuss at the scale and tell myself that it's all that strength training that I'm doing
and I don't care what the stupid scale says!