I believe in the power of prayer but the honest truth is prayer without action is nothing. Their are few tips you could use to overcome nervousness.
Practice whatever makes you nervous ,for instance if its public speaking,seek out opportunities to practice talking in public.Attend a public meeting and voice your opinion..if you are nervous about dating,get a friend to go on a practice date with you.Practice the conversation you intend having with your love interest,go to the place you would like to go on a date.
Another tip is that that you should prepare in advance.if its a job interview, research about the company and the position you are going for so that you can speak knowledgeably.For a date,think about questions you can ask your date about themselves
Another useful tip is to be positive. Visualize yourself doing well and not being nervous.think positively.Walk through the events that makes you nervous in your head and imagine yourself calm and successfull
I believe this tips should help.Goodluck