I just got my first fill today! I was kinda nervous but I have to say it was fast, easy and not a problem at all. The only thing that surprised me was when my surgeon told me that I could get a fill every WEEK til I felt the restriction that worked for me.
I went into the office, the surgeon talked to me for a bit, I got comfy on the table with my arms behind my head, he felt for the port, found it and marked it with a pen. He then injected a tiny amount of numbing stuff and injected 4cc's into my port. He put a small band aid on and I sat up. He had me sip Water to make sure it would go down and voila! done!
I am sure you'll do fine and after the first fill, you'll know what to expect and wont be nervous any more!
Good luck!