How will I know when my hair's truly growing back?

How will I know when my hair's truly growing back, i.e. not sporadically or clumpily?

Right now when I run my hand over my head, there's a little bit of bristle. I shaved it on Saturday, in preparation for Joline's tattooing my oddly-shaped canvas.

But the growth is irregular, and not very much for a week's growth. I'll keep shaving it as long as it's so spotty.

How will I know it's growing back, full force?

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The spouse and I went for a walk at Green Lake this morning. It was a short and slow walk. It's like someone turned the tap on my energy and it's all drained out.