In the absence of a male occasionally two females will spawn. Once in a while you'll get a threesome, angels like to swing that way. If there is minimal white eggs, and they are that light tan color for a few days you do have a pair. Around day 3 you should see wigglers, by day 6-7 they'll be swimmers. Once they're wigglers the parent's may move them, so if they disappear keep an eye on any new area the pair may be hanging around.
New pairs often take a few spawns to get the hang of it, and some pairs never get to the parent raising part. With the inbreeding & line breeding methods used to get the various phenotypes the parent raising instinct has been somewhat bred out. Don't be disappointed if they eat the spawn, wigglers or swimmers. If you haven't hatched baby brine shrimp before now is the time to get those supplies together, but since you mentioned raising livebearers I'm assuming this is something you're familiar with.
If you get them to parent raise the first spawn, or any spawn for that matter you've got a good pair. Fry that were parent raised tend to be parent raisers themselves when they mature. The parents are a lot better at culling then we could ever be, they've been doing it much longer. Try to keep activity around the tank to a minimum, commotion will often spook the parents, and the spawn becomes a snack. There's many books written on breeding angels, one of the best online resources for getting started is Breeding Angelfish