You need latex gloves, KY Jelly and you should read this thread:Update on hen, her crop seems to be fine she is eating and drinking now, standing up and even pecking at me. She seems to be skimny. So to feel for a egg I have to actually stick my finger up the vent and if there's an egg and it is stuck then what? She is a very small EE. She ate some bread so now I know she is better I couldn't get her to take anything.
https://www.backyardchickens.com/t/738201/goose-what-is-this-how-did-it-happen-what-do-i-do-about-it