Although it is in the Goose forum this thread is full of excellent information (it's more of an article than anything else) and applies to any incubated birds egg.
https://www.backyardchickens.com/threads/goose-incubation-hatching-guide-completed.491013/
Some people will not assist a chick that is stuck. I always do because it's more than likely my fault that the chick is having trouble and I think it is my responsibility to help them and deal with any resulting issues (of which I've experienced very, very few). I've once had to assist a duckling (who was perfectly perfect) and I've helped a few quail over the years. Using an incubator is artificial and it will never be as ideal as a good broody hen/duck.
This is an excellent assisted hatching article to keep on hand if that's something you want to do:
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/
The article even has photos of ducks assisting their own ducklings to hatch.