Get your hands dirty
Definition 1 of 2
Pro Tip 1/3Figurative Meaning
It means taking action, not literally dirtying your hands. 
The volunteers got their hands dirty to rebuild the park.
Pro Tip 2/3Positive Connotation
Usually implies hard work and dedication positively. 
She got her hands dirty and turned the failing company around.
Pro Tip 3/3Metaphor for Effort
Used to express willingness to work on challenging tasks. 
Successful entrepreneurs often get their hands dirty.