Sounds like you got first class treatment from your ext agent as I did from mine. I gave the guy my garden measurments and he told me just how much to use and where to buy it, a local seed company. I am sold on the soil sampling. I now know why my squash and peppers did
nothing last year. My PH was way off. Also I had no, none, nitrogen. He said it was a wonder that I got any maters at all. We were feeding them regular, though, with MG Tomato food.
It would have been ugly to hit bricks with the tiller.
Good luck with the garden.