be a huckleberry over (one's) persimmon

dated To be somewhat or slightly beyond one's abilities or talents. Primarily heard in US. I'd like to help you fellas out, but I'm afraid herding cattle is a huckleberry over my persimmon.

Common Names:

Name	Pronounced	Usage
Susannah	-	Biblical
Roxana	rahk-SAN-ə (English), rok-SAHN-ah (Spanish)	English, Spanish, Romanian, Ancient Greek (Latinized)
Seyfullah	-	Turkish
Roeland	ROO-lahnt	Dutch
Mega	ME-gah	Indonesian
Persephone	pər-SEF-ə-nee (English)	Greek Mythology