Hi xa ... I am in NW OK and breed English Angoras. I find that the upkeep is not too bad until the 3rd month of coat growth. Up to that point, a nice brushing and blow through the coat is enough to keep them matt free. That last 3 weeks or so, the grooming needs to step up to 3-4x per week to keep the coat in good condition. When the rabbit is blowing it's coat, plucking the prime fiber is easy enough ... just pinch the tips of the fiber and pull gently.
As for quantity, well, it depends on the quality of the fiber your buns produce, but look for about 12-16oz of prime pluck per rabbit per year ... and depending on how many full coats you get per year. Going back to the comparison you are looking for, a regular, commercial skein of yarn is about 6 ounces of 3,4 or 6-ply yarn. To really "see" what needs done with your fiber, take a commercial skein and look closely at the plys ... each one of those are what is spun first and is called a "single."
I also spin my fiber, but right now I am still waiting to receive my spun fiber back from a fiber/yarn contest. I am also "sitting" on the most recent pluck from my herd buck
One thing you might want to consider for the summer heat is a modified cut where you keep everything but the longest prime trimmed short. The prime comes from the sides, back, rear area, so the head, chest, legs and underbelly are the areas that can be kept trimmed. And, it cuts down on the grooming needed
As for the spinning ... well, for me that is a whole 'nother bit of fun! I would suggest joining (free) Ravelry(dot)com and check out the different spinning groups there or on FB ... then, for some serious eye-candy, browse etsy(dot)com for some dyed unspun fiber! Angora blends with just about EVERYTHING!!! LOL I started out with a spindle for spinning ... better price for getting my feet wet without the expense of a spinning wheel
Whatever you decide, angora rabbits can do well in hot areas with just a bit of coat management.