If you don't
get your shit in one sock, you are never going to get that project done on time.
This term originated in the
US Navy, and a "sock" is a term for
seabag. A sailor who was not organized would not be able to put all of his belongings in one bag to be ready for quick deployment. Hence, the need to "get your shit in one sock".
After watching someone perform a task really well, you might say "Wow, that guy really has his shit in one sock."