Technique

You wanna know if a girl is in the mood or isn't getting along with your flow. This is how to know. You can start with a suitable chat, a lot of laughter and smiles, then you go in for her hand. Then in a couple of minutes after, try holding her on the shoulder and drawing her closer to you. If she still doesn't push away then you can try holding her waist, again drawing her close to you.
 And all these should blend with the kind of conversation you having so that it wouldn't feel awkward and she wouldn't think "what is he trying to do?". And you shouldn't run out of words during the conversation but in case you do, try tickling her or doing something to occupy you two during the silent moments. 
Draw her closer to you by grabbing her on her waist, try the fore head kiss first and if she doesn't pull away then she is into it so you can go ahead and kiss her on her cheek to be extra sure she is feeling your flow before you go ahead kissing  her on the lips.
You can add a little flirting and it should be done within minutes not seconds. Shouldn't be as if you rushing her, you should maintain eye contact and if you being rejected you would obviously realize it from the start and safe yourself the embarrassment of her rejecting your kiss.
You can also try taking a risk by just going for it. That is if you are certain the girl is into you but it may end badly. Be smart