hi, i am no expert either but if the eggs will not pull apart easily do not force them as you will damage them.
Last year my first clutch were all stuck together, i didn't pull them apart as they were firmly stuck together. They all hatched perfectly though.
When Ruby lay her second clutch i was fortunate enough to be there while she layed so i removed each egg straight away as she layed them, only two stuck together but they came apart very easily.
Hope this has been some help to you, i don't know whether anyone else has any idea's for seperating eggs but personally i wouldn't try if they are really stuck
Good Luck
Isobel