* Learn your shell language -- really learn it. Learn how to fit programs together, how to manage jobs, and all of the control structures in your shell language. Avail yourself of aliases and shell functions.
* Learn the Unix command set, sed, and awk. Practice using these tools to do complex data or textual manipulation tasks.
* Make a personal ~/bin directory and add it to your $PATH. Put shell scripts that do useful things in there.
* Learn enough of a real programming language such as C or Python to write small programs to do common things that would be slow or cumbersome to do in shell. Put them in your ~/bin.
There, you'll be Unixing like a boss with a minimum of prompt ricing.