How do you know when to put your arm around a girl?

Anonymous
I think I'd wanna put my arm around a new girl before I kiss her for the first time--I'm too nervous to just go in for a kiss. I'd do it while we're taking a walk on the first or second date, while watching a movie, etc. Is it a good idea?

And how do I know if she'd like that? How can I be sure that I'm not awkward about it? I'm shy and awkward around girls, but in rare moments I can be confident. Thanks. : )
Updates
+1 y
Any ideas at all would be helpful thanks : )
How do you know when to put your arm around a girl?
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