It was hard for me too. I am in Canada and searched using the canada bird breeder directory on the net.
Abundance weaning is the best way, meaning the breeder allows the baby to slowly and gradually wean at its own pace by handfeeding and also introducing new healthy foods, veg's, fruits, pellets, etc.
Every baby is different in terms of how fast they become independent and eat on their own.
By making the bird wean faster than it would like to, you are at risk of the bird haveong emotional problems and also learning that humans cannot be a trusted source of food and proper care.