Hi Lauren
Im by no means massively experienced in meetings, but have found the following to help a little...
If you are nervous, do some breathing excercises before you go in there. I was told once to push against a wall or sttionary object - it helps release tension! Keep your hands off the desk (you will most likely fiddle with your pen or something and this makes you look nervous and i a bit distracting!) unless you have drafted up a small presentation or something?
Have a small card with points you want to make to keep you on track. Ask what is expected of you - get them involved in what you talking about you will get some feedback you can comment on... Point out areas of improvemement you have identified, and give them solutions.
Dont worry/think too much about the grade move - if it doesnt work out, at least you have shown that you are hard working and conscientious! You can always bring this up next time you have a pay review! If your manager is a good one, then they will helpyou progress - just go in there and be yourself - you will be fine!
A.