How to make sure she says yes?

So there's this girl I like at work. I'm trying to get to know her better and she thinks I'm awesome but I don't know if she likes me or is just like being a friend. I asked her to a movie but she said she has already seen everything worth seeing. She agreed to coming over to my place to watch a movie. I don't know if I should make a move or tell her I like her because I'm afraid of either scaring her away or giving her the wrong impression about me. I really want to get to know this girl and ask her out on a date. Should I lead with that or just keep hanging out with her and being her friend longer? You never get the girl if you never take that first step and I've been veering away from that because I face a lot of rejection. I also have been told multiple times that girls have liked me when I didn't even know it.
How to make sure she says yes?
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