How do you master something??

You do it one thing at a time. 


Do what one thing at a time? 
You master and ACHIEVE things by working at it one thing at a time. 

Rome wasn't built in 1 day, and it wasn't build in 2 days either. 
Take the time and DILIGENTLY work towards ACHIEVING your goals by working on one thing at a time. 

When eating an elephant take one bite at a time.
~Creighton Abrams

P.S. Don't swallow your "elephant" (your work) whole... you might choke!