style12345, thanks! Glad that helped a bit.
If you think about yourself as an interesting person, simply focus on yourself and speak about topics you find interesting. When a man is interesting enough it feels through his voice, the way he speaks, walks, moves his body and so on.
When woman is interested, the more she has attention, the better she will hide it and it can be though not as an IOI but as IOD. What works for me - if I have a question about a message a girl sent me, I simply put something really mega-unattractive in my shoes and think if she would have done the same.
As woman is interested in you she will:
a) find time for you
b) will smile for you
c) laugh at your jokes
d) she will ask you questions. That's the easiest to spot. She will ask you questions about you, your life, your job, your views, opinnions. As you're an interesting and confident person, you will share your vibe and you will need no tricks or so to show yourself.
e) will get in contact with you even for an innocent thing or a question
the list goes on and on.
She will look much or less like a cat.
To see if she likes you is a combination of a lot of variables. But the universal ones are the called IOIs. She's interested if you "feel" that. And what's the feeling.. well that's personal thing

. I myself somehow feel if a woman is interested in me by her behaviour towards me.