How long has it been since you took the driving test to get your license?  My daughter takes her test this morning and she’s a bit nervous.  She’s concerned about what will happen if she messes up or can’t remember something.  I told her, “It’s natural to be a bit nervous, but you’ve practice driving daily for a year and a day.” 
It’s the Georgia requirement; student drivers must wait one year and a day after getting their permit before applying for their license.  Is that one day going to make any difference?  Really?  Sorry, I got side tracked. 
Back to my conversation with my daughter: “You’re ready, even if you don’t feel like it.  You’ve been doing this for so long, it will come to you.”
I had to laugh when I thought through our conversation this morning.  We’re the same way when it comes to sharing our faith.  We’re scared to death and come up with all sorts of reasons why we’ll fail.  “What if I don’t say it right?” or “What if I don’t have all the answers to their questions?”  Let’s face it, none of us have all the answers but Jesus.  In 1 Peter 3:15 we’re told to be prepared to give an answer for the hope we have.  How do we prepare oursevles?  We spend time with the Lord, learning His Word, talking things over with Him, so we know what He thinks about things… just as He spent time with His Father [Mark 1:35].  As we spend time with Him studying His teachings, discussing them with others, and meditating on them, they take root in our hearts [Deuteronomy 6:7].  The words will come to us at just the right time.  
Mark 13:11b says, “Just say whatever is given you at the time, for it is not you speaking, but the Holy Spirit.”  If you haven’t spent time with the Lord and become familiar with the nudging of the Holy Spirit, you might squelch Him out of fear; however, if you come to know His voice you’ll speak freely with confidence in Him and what He’s doing in and through you [John 10:27].  It requires a leap of faith [Hebrews 11:1].  
Indiana Jones had to learn about faith. The bridge doesn’t show up until you first take the leap.  It may be scary, but you can do it.  After all, you aren’t trusting in yourself, rather the One who sent you to deliver a message.  So what will it be?  Will you speak?  Will you have faith the words will come?  Do you have enough faith in Jesus to trust Him in this?  Don’t overlook the fact that He has enough faith to trust you.