Norwegian: Teaching fish how to swim

[defesad]

Dear friends,

I am looking for Norwegian idioms/phrases/sentence examples that use the Norwegian equivalent(s) of this English proverb:
"Teaching fish how to swim"
= Teaching grandmother to suck eggs.

I have been given one: egget vil lære høna å verpe.
Any other suggestion?

Thank you.

 

[raumar]

I can't think of anything. "Egget vil lære høna å verpe" exists, but I can't say that I have heard it much. Maybe Norwegians tend to express this in other ways, not using proverbs?

 

[basslop]

I can't come up with anything similar either. I agree with Raumar about "Egget vil lære høna å verpe" . Instead of using animals maybe this one:
"Å slå inn åpne dører." - something like "To beat down/in open doors" in English.

 

[defesad]

Thank you.
Any suggestion is appreciated.
Basically, I need an expression (quote/adage/idiom/maxim/saying/proverb/aphorism/phrase/sentence example, etc) which means or implies that "somebody tries to show a more experienced person how to do something."