One thing I have observed from the Word is that every biblical record of a person exercising the power of the Spirit was a mature believer, who had been in the Word and discipleship for a long time. It seems plain to me from these testimonies that the power of the Spirit comes on the heels of an intimate relationship with the Father fostered by a deep study of, and obedience to, the Word of God. One possible exception is Balaam’s donkey, but she wasn’t a person and I think this just demonstrates that the Father can use any vessel He chooses. And don’t get me started on the puns I can make from this. Ass me no questions and I’ll tell you no lies. Another possible exception might be Cornelius in Acts 10, but it is clear from the context that he has been at it a long time. It doesn’t appear to me from the Word that ‘rookies’ had a great deal to do with relaying the power of God.