Dont worry. Can see advantages to leaving til after first frost,but as theyre up now,put them to bed til spring in the recommended way. Not the end of the world.

As Pajo said in reply to your previous question, just let the top growth dry out naturally and drop off when it's ready. That way, some of the food in the leaves and stems goes into the tuber for next year.

I'd just put the tubers minus the compost you can get off easily on seed trays somewhere cool. Inspect every week or so and pick up the dead bits as they fall off. Then gently clean off any remaining compost and keep where mice and so on can't get at them til next spring.

the only reason they say wait till the first frost is so you prolong the current flower display, no sense pulling them up till they're done. But we all do because we usually want to put winter bedding in instead anyway.