How to know if she likes me?

This is one of those questions I always ask myself with the opposite sex. Currently, at my job there are two women that have caught my eye. I just can’t figure out how to really know, if anyone of them likes me. The reason I am asking is due to me making mistakes thinking a girl likes me, then to find out they just want to be friends. Despite how much I might be attracted to them I am sitting here biding my time to really scope them out. I want to figure this out, so I don’t lose my chance with either one. Thus me asking for help. Thanks in Advance.
How to know if she likes me?
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