Congrats Hannah! This is a very exciting time for you all! My advice is to treat Gizmo just as you would another child. Keeping things as normal as possible for him, (that will be hard, but you can do it) as the others said, ease him now into any change in routine that you will expect. Also when the baby is not in your arms, spend time with Gizmo so he won't get jealous. I would advice putting him in another room or his cage when you are interacting with the baby if he tends to fly to you.
As Judy says, don't take your eyes off him for a second around your baby. You will find that you will be able to adjust your time and schedule for them both if you re commitited to do so, and I know you are.