Moves are like an earthquake. Making a move changes things. You cannot expect to make a move and expect no one to notice, least of all the girl you're putting the moves on.
But that's a good thing. Because how she handles it tells you whether she's into it or not.
If making a move was covert and indistinguishable from not making a move, she would have nothing to react to before it was actually happening.
That would be like a stand-up comedian just saying punchlines without the setup. Just plain weird.
Watch this clip from Season 4 of Weeds.
http://seriesspoilers.com/video/6326/Weeds-4x7/ (about 11:05 in)