You can look at 1 Timothy 3:1-10 > this shows the qualifications of a pastor or deacon. Even though someone is a Christian, still the person must meet these qualifications in order to be trusted to lead God's people.
Likewise, you can expect to be tested before you are trusted to lead the church with piano or song.
Your past before becoming a Christian, though, should not be considered . . . if you are clearly changing out of that bad behavior and other wrong things of personality - - - and learning how to relate in love and how God's love has us becoming emotionally >
"Let all bitterness, wrath, anger, clamor, and evil speaking be put away from you, with all malice. And be kind to one another, tenderhearted, forgiving one another, even as God in Christ forgave you." (Ephesians 4:31-32)
"Do all things without complaining and disputing," (Philippians 2:14)
"But put on the Lord Jesus Christ, and make no provision for the flesh, to fulfill its lusts." (Romans 13:14)
So, I say you should encourage him to examine you. And you, too, be sure to evaluate if and who you trust and how you trust each person. But I would say, that in examining someone, you do not evaluate only by what a person looks like!!
"'Do not judge according to appearance, but judge with righteous judgment.'" (John 7:24)
I have seen how someone can be absolutely charming, intelligent, talk Jesus, be talented and beautiful. But then she might run through a string of men in bars, looking for a husband, be intoxicated at a church event, then marry someone and want a divorce within months. That is not a role model person who should be appearing in front of a church and managing ministries. Ones like this need to get with Jesus and learn how to be and how to love, how to do things in Jesus Christ's rest for our souls (Matthew 11:28-30, Colossians 3:15), and how to test reliably about who they trust and for what they are trusting each person . . . not just praising everyone for being so great, without evaluation.
So, not only should you be evaluated, but you need to learn how to evaluate. And learn to live in Jesus Christ's way of loving with rest for your soul >
"'Take My yoke upon you and learn from Me, for I am gentle and lowly in heart, and you will find rest for your souls.'" (Matthew 11:29)
And yes there will be people who do not know how to evaluate you and ones can be even abusive. You need to be ready to love them and forgive them, and do not automatically trust them just because you forgave them, but test >
"Test all things; hold fast what is good." (1 Thessalonians 5:21)
How we are spiritually and emotionally can be what we are spreading to help others to become the same way. This includes during your prayer, not only in public in church. So, maybe we could say, never mind if you are up front ministering, because also you are ministering while you are alone and praying or doing other things.
So, how to be is important > this is what can spread >
"rather let it be the hidden person of the heart, with the incorruptible beauty of a gentle and quiet spirit, which is very precious in the sight of God." (1 Peter 3:4)
God sees deeper than you eyes!! And He will make sure you do what He really wants you to do.