I'd guess I get Final Jeopardy about 2/3rds of the time ??
While watching the show, I don't do anything as far as having a clicking device. I just say the answers with the goal being to say them before Alex has finished reading the clue.
I find that a big thing is I often have an educated guess about an answer. Under normal circumstances when I'm watching at home, I'll just blurt out my guess every time. But now that I am trying to get in serious mode, I am practicing making that snap decision. Am I going to take a chance on my guess or not? So I say my answer out loud if I feel I would take the chance, otherwise I say nothing.
Trying to simulate the real game experience a little bit.