regarding banding, I use the split bands (like key ring loops) in a variety of colors to identify keepers from one another, within a certain breed. I also wing band everyone (jiffy bands, takes a special tool to crimp them on but they won't fall off accidentally either). my wing bands are numbered so I can keep track of who's who, hatch date, breeding line if I know it, etc. whatever info I've got. they get banded anywhere from a day old to adults and then if I have a number of birds that look alike, the colored bands help me tell one from the other. like my silver grey dorking girls. I have pink/white (aka pinky), orange, green, white, yellow and dark blue.
for now, everyone else I can tell apart, those that I need to at least.