Make sure I eat everything (even force things down i don't like) and don't eat too much and appear greedy.
No, it's not about appearing greedy. It's just simply impossible to try everything if you take large portions.
For example for my last Christmas Eve, there were: soup, 2 kinds of fried fish, pierogi, fried mushroom, beans, 3 or 4 kinds of herrings, 2 or 3 kinds of sauerkraut with mushroom, carp in aspic, 2 kinds of cake, noodles with poppyseed and and more stuff that I can't remember. And think: you should try everything... It's possible to handle only in small portion and with some alcohol (preferably wine) to help you digest.
Don't write who the gift is from. Just write the name of the person it is for.
Yes, that's right! Quite important...