Quakers that have been hand-fed, for the most part, are used to human interaction and are accustomed to being handled and played with. The longer a Quaker has been hand-fed, the better the chances are that it will turn out to be a very tame, friendly pet. In fact, I think most Quakers that have been hand-fed from day one believe that they are human! Hand-feeding produces Quakers that are very social, and they require additional taming and/or training only if they have been allowed to believe that they are dominant, such as those that were caught in the wild and are now adults, or those that were raised by their natural parents with little or no human interaction.
In my personal opinion, Quakers kept as single birds make the very best pets, although that is not to say you cannot have more than one pet Quaker. If you choose to keep more than one, it would be in your best interest to keep them in separate cages if you want them to be as tame and friendly as possible. Normally, Quakers that share living quarters with other Quakers will most likely bond to the other bird instead of to you. Admittedly, though, this is not always the case. Ideally, a young Quaker should be placed with its new owner at six to ten weeks of age–by then they are usually weaned and their bonding instinct is strongest at that time. This is the ideal time to begin nurturing a relationship with your bird, and setting a routine.