I don't think so. There are many people I know, both on these boards and among my friends, who measure their success in weight loss by the inches lost and the fit of their clothes rather than the number on the scale.
In my case, I didn't have a scale for the first half month after I started dieting, and the inches certainly weren't coming off fast. Once I bought a scale, I was a little shocked and kind of depressed when I saw the number (it was 5 kgs higher than I expected), but once I started checking it regularly, it became my biggest source of motivation. Seeing the number creep down, however slowly, makes me crazily happy
That being said, I saw something awesome that someone had written, saying that when you're at the beach, people are going to see the body you've got, not the number you see on the scale. I really liked it. I'm assuming that's the mindset you're coming from, which I think is totally fine.
In a nutshell, I think weighing yourself is a good way to know exactly where you are and what your progress is, but if you're better with measuring yourself and holding yourself accountable to that, that's cool too. To each his own
Don't worry so much about how you're going to measure your progress though, concentrate more on making that progress happen one way or another.