What you should do is to stay calm and compose yourself so that he may not notice your nervousness if you also want to kiss him. The best thing you can also do if you are also for that kiss is to apply some nice lip balm but not too much and be yourself, don't overdo anything.
no do not call him and tell him your nervous i know exactly how you feel! just be cool and go with the flow.. and i know its sounds hard but try as much as you can to not be nervous or appear nervous, everything will turn out wayy better than u think. hope this was helpful.
Here are some tips eat somthing that does not smell before you kiss him act like you are cool and calm dont rush it take your time dont smile to much but do not look upset get close but dont pop him since it is your first kiss do not feel around if youknow what I mean just enjoy it hope this helps ya