Abundance weaning simply means you let the bird decide when it's done being handfed. I find that my lovebirds start to get a little annoyed by the syringe at 5 or 6 weeks of age. They balk if you try to give them the usual size feeding. Don't force the issue. Let them have their taste, then supply them with as wide a variety of foods as possible.
Lovebirds do tend to thin down quite a bit during the weaning process.
Pay careful attention to this as you don't want the bird to get too thin. I find lovebirds are just not big piggies when they wean the way budgies are. Lovebirds tend to eat a little all day long rather than pig out. There is nothing wrong with offering a little formula just to be sure, but if your bird has been going four days on just a tad of formula, you can be pretty sure they are weaned. It's always better to go a little long with handfeeding than to wean too quickly.