Hi
I like trying something new each year too, that why I tried growing amaranth, a close relative of quinoa, last year. I did not get any good grain out of it (tried, but too hard to harvest) but the flowers were pretty- very heavy, too and needed a tomato cage to avoid flopping over. That said, it was the "Love Lies Bleeding" variety- an ornamental. Maybe if I had gotten a true grain variety I could have gotten a useable edible harvest. I think quinoa is more or less the same.
The trouble with harvesting the grains, for me, was I didn't know if they were ready or not. Did I take them from the live plant, or dry the plant first and shake it out? Then, I had no possible way to separate the seeds from the tiny crumbly little petals. I just gave up.
There are two books that talk about home grain raising. I have not read either, but have heard of them. "Homegrown Whole Grains: Grow, Harvest, and Cook Wheat, Barley, Oats, Rice, Corn and More" includes quinoa. There's also one called "Small-Scale Grain Raising: An Organic Guide to Growing, Processing, and Using Nutritious Whole Grains for Home Gardeners and Local Farmers". I don't know if it mentions quinoa or not, but you could check the library or a bookstore.
Hopefully someone else could be of more help.
