above (one's) bend
Exceeding one's knowledge or ability. Lifting that heavy box is definitely above my bend—my arms are too scrawny for that! He's a great handyman but electrical work his above his bend.
above one's bendand above one's huckleberry
Rur. beyond one's ability. Fixing those new cars with computers in them is above my bend. Joe's a good cook, but fancy desserts are above his huckleberry.