You make it sound easy.
Because this part is
easy. It's finding a woman who's similar to me that is incredibly hard.
I can recognize the kind of woman who will likely to be interested, because I'm naturally attracted to that kind of woman myself (some characteristic traits are introversion, non-flashy/asexual clothing, rufosity, paleness, freckles, artistic and/or scientific interests, liking plants/animals).
Long eye contact (staring), a faint but assuring smile, as well as frequent appearance at the same place at the same time are rather obvious signals that aren't hard to notice.
I've learned to not even bother with other kind of women, they're like another species (probably literally are).