We have two who are good as gold and just stand there and then we have one that is just horrid!
Crosley who is the big one is awful! She's 6 1/2 and she's been going to a groomer her whole life and she's never gotten used to it!
Some are just easier than others, but starting them young and doing it on a regular basis will make it better for some of them!
Good luck, I feel your pain!