U dont just tilt her head and jump her Rye Lee!!
Look at her, start triangle gazing (eye to eye to lips) and keep doing that slowly while matching her breathing. Slowly move closer and tbh, if u have your arm round her and she IS cuddled up to you then it WILL work without resistance.
Or maybe its just my sexy eyes that make it work

Who knows!! :p
Rye Lee's method is a very similar method imo, and like he said there is a need for comfort and attraction. Now, as a general rule i will never go for a kiss until i have first got some IOI's (like you have, her leaning on u, cuddling up etc) however the other key thing to do is some simple complience tests. The reason i am always carful with a first kiss is because do it to early and its normally game over, do it a little late and u will not be kicked out the door!
Now just because you are doing simple complience tests DO NOT MAKE IT OBVIOUS YOUR GOING TO KISS HER! I cant stress that enough, imo, every girl likes a spontanious kiss. Its confident, alpha and generally more sexy.
Dont go over the top on a first kiss though! just a quick kiss and make sure your the first to pull out. It shows much more self control and will leave HER wanting more.
/madals
p.s. tbh is a shorterning of to be honest.