Don't be aggressive with your fills. I would suggest no more than 1cc for the first fill.
For the fill the doctor will have you lie on your back and feel for the port. Once they find the port there is a rather long, but not to big needle that they stick in. You will feel slight pressure and the typical needle prick. The doctor should pull on the syringe to make sure there is in deed no fluid already in the band from the surgery. As they will put fluid in to check the function of the band and the placement.
Once they put how ever much fluid they are going to put in. They usually have you sit up and sip a little water.
I can tell you once you start to have restriction you can feel everything go down. Feels a bit weird, but you get use to it.
Also, once you have the fill be very cautious of what and how you eat things chew, chew, chew.
I don't know if you have had anything stuck yet, but trust me you will know it and there is only one way to relieve the pain.
Sounds like things are going very well for you. Best of luck to you.