Yeh everyone is dead on. You need lotsa room to rais all the youngins and it is a big job feeding and cleaning for them all. I imagine it would be hard to do if you weren't living with the fish in your house and even hard if you worked away from home. So the two biggest problems are ample space and maintenance/feedings. If you want to do it casual with less maintenance I have one suggestion which can work. Have as large a tank as you can, at least 30-40G, and have it heavily planted, perhaps with a little co2 and/or liquid fertiliser, try and overfeed the fertiliser and have your lights on for more than 12 hrs so that you iduce algae. If you can get enough algae growing on the walls of your tank etc. then the fry will love to eat it all day long, thus you could get away with feeding then once or twice a day with bbs. Fry love to eat algae I have found. I am fairly sure in the wild they eat heaps of it. The amazon river floods into the grass-lands where it is not use to the water, which creates lots of algae, and this is where the angels spawn. You do the math. The fry would eat algae as well as any small water fleas etc.
Good luck to your angels. Also, if you are on good terms with a pet shop you like, try and see if they would buy your stock. Some won't because breaders are actually suppose to have a liscence. In-fact you are not allowed to breed fish without one. hahaha. Madness. How can we stop them half the time?