Answer:
A person's greatest asset.
What is it that given one, you'll have either two or none?
If you can get this professional's attention you can get where you need to go for a price.
Where jewelry pierces your head.
What is full of holes but still holds water?
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?