Some background info:
I'm taking a domestic flight out of Newark, scheduled to depart at 6AM, on Southwest. No checked baggage. The flight is on a Tues morning in the fall, if that's relevant. I'm coming from central NJ. I plan on checking in online.

My main question is how early should I get to the airport? On top of that, what options are there to get there? I've already considered NJT, shared van, and taxi. (The earliest NJT arrives at EWR is 4:48, but I think that's cutting it a little close)

Any suggestions or advice is highly appreciated!