Is there an idiom or euphemism for when someone has an average/small penis but knows how to use it?

Really, what the question title states. In my language there's a more "flowery" phrase to say "size doesn't matter". It would roughly translate to "even a small clown can work in the big top" – I'm looking for something that tries to maintain the wit of the "small"/"big" antithesis.

Solution 1:

It's not the size of the boat, it's the motion of the ocean. comes (no pun intended) to mind, although I'm sure there are many more.

Solution 2:

One that applies to more than just sex (expressing small size doesn't imply bad performance) is:

it's not the size of the dog in the fight, but the size of the fight in the dog