One that I'm guilty of is not really measuring anything. But I just one day decided to start making a quilt, and so I did. It's just all going to be squares so it's not really gonna matter anyways. Even though the squares are going to be differents sizes lol.
And I don't really care how it turns out because it's my first and I knows it's not gonna be perfect. As long as it keeps me warm I'm happy.