So after a few months of training, my instructor eventually told me I was ready to test for belt advancement. I got very emotional and I didn't know how to react. Contrary to the reaction of pride you might expect, I was emotional because I felt unsure of myself. I had been under the mistaken impression I would work the white belt level techniques until they were muscle memory. Or at least that was what I had hoped.
I was afraid of falling, because safely falling wasn't my strong suit. Forward falls in particular were hard for me to perform. I was also afraid of getting hit, which was actually a long way off. Presumably however, my instructor knows when I'm ready. He or she has gone through the same program I'm going through, they've helped me progress to the level they were at when they were asked if they wanted to advance. They know more about the system than I do.
I told my instructor I didn't feel ready, and I wanted more time with the maneuvers I still wasn't good at. They basically said "I'm your superior, and I know what I'm talking about." They said it more cordially and philosophically. That's all behind me now, and I have advanced. But I wonder if it would have been unreasonable to hold my ground and really kind of demand the extra time.