And it's all worth it. Birds love repetition. So the trick is to set up good habits from the time they are babies. Not to say you can't get them into good habits at any age, it just takes longer. That's understandable when you consider you are asking them to break an existing habit.
Birds tend to look at situations after the fact and determine if all went well.
If Yes , they are more apt to let you repeat it again. For instance, let's say you are trying to get a new bird to stand on your finger. If you grab him and put him on your finger, the memory will be of an unpleasant experience and it will be even more difficult the second time. If, on the other hand, you simply hold your finger in the cage for a short time, all the while talking to him in a loving voice, then remove it, the bird thinks, Hey, that was okay . So the next time you put your hand in the cage, he or she will probably ignore it.