This is partly why I started playing
freerolls, you get nervous at the thought of missing out on cash, but not as nervous because you dont lose a buy-in, you only lose time.
The rare times I do play cash games, I still get nervous. I try to pretend like I'm playing a freeroll which sometimes helps (especially if you got a bunch of freerolls open that you're playing at the same time).
Nervous ultra-cautious play might help you beat the bubble and get a dollar or two, but it usually wont get you to the final table.