It sounds like you are making good progress. It may seem like its going slowly but its the right thing to do and well worth it in the end.
Try and have your grey Charlie in the family room if possible, they love to be involved and see everything thats going on. This will get Charlie familiar with your daily routine and household noises etc.
Keep taking things slowly, babies do adapt quite easily, I hope everything continues to go well.
Great name choice, my eldest grey is also a Charlie and he loves to tell me his name constantly lol.
Keep us all updated and would love to see some pictures.