A second chance has come, please give advice after reading :)

I've posted here before about a girl I have liked for 3 years. I recently became her friend and it turns out she's bisexual. I asked her and she said I could kiss her, I was gonna do this last month but even though I had the opportunity I felt it wasn't the right time. (aka I had no courage) However, this Friday I will likely see her again and I may have another chance. This girl is the one I've wanted for so long... She made me realize I was into girls and she's beautiful inside and out. I want this kiss to be the best one ever for both of us. Now all this being said, how do I make it happen? How can I stop myself from getting too nervous? How do I build the right amount of tension? How do I set fire to her heart the way she has set fire to mine?? Please help i'm already a nervous wreck. :tears::tears::bang::help: