Think about what it's like to have your hands full of stuff -- you can't carry anything else, and it's hard to hold onto what you've already got. The idiom means that you already have enough to do and cannot take on any new tasks.
If you have your hands full, you can't do anything else with them, can you? This idiom means that you're overloaded and don't have time or ability to do anything else.
Money "changes hands" whenever anything is bought or sold.
idiom meaning full of self-confidence, overbearing pride or presumption; arrogance
The expression "to be short handed" is not an idiom, since its meaning may be guessed from the words in it. It means having too few "hands," or crew members.
To "take off full blast" means to start quickly. The idiom refers to a motor or jet engine starting off at full blast or full throttle, which would be as fast as possible.
idiom meaning full of self-confidence, overbearing pride or presumption; arrogance
This is not an idiom. It means exactly what it says -- someone is putting their hands into their pockets.
It means to get your full attention and listen to what he/she is going to say
"To be" is not an idiom - it's a verb.
"The cup of coffee" is not an idiom that I know of. It just means a cup full of coffee.
Pest is not an idiom. It's a word.
The idiom "apple shiner" means the teacher's pet.