If I may do more searching on calling. There is more there that no one here has touched.. as of yet
I think Paul was telling Tim "Do not hurry to lay hands on anyone [ordaining and approving someone for ministry or an office in the church, or in reinstating expelled offenders], and thereby share in the sins of others; keep yourself free from sin.".
You asked about how do you know, recognize what His calling is. I'll give just two experiences in my own life. Short is went for a walk after Sunday service by myself. I said "Lord I know you called me but I don't know to what". That night we the choir sang (we went to different Churches and did this) we would go out and pray for the people. Well I noticed Roy was not praying for someone but they were praying for him. So lol I just knew it was of God and had a thought if I go over there maybe he will pray for me. I don't know, can't tell you other then I just had that thought. So I go over and he takes hands of Roy puts them on me and says "My son I have called you but you do not know to what but I will open all the doors. You have great faith......" so forth so on.
Two things there. First one is we notice God said what I asked Him "I know you called my but I don't know to what" Him "I have called you but you do not know to what". 2nd, Now even though I knew it was of God I still went to my pastor told him about that man and asked if his word could trusted. That man was known and yes it can be trusted.
2nd experience. We were about to got to Church Sunday night me and my wife and I said "lord I know you called me but can you tell me again. You said out of the mouth of 2 or three. Thank you". We had been going to that Church .. I 6-7 years and for the 1st time ever and then never again 3 people that night came up to me, people I did not hang around with nor did I know saying "you should be in the ministry, you should be a preacher." so forth so on. Three 3 times.
I am not like most. What I read in Acts has does and will keep happening in my life. Acts is Christianity. There is a song but its true about calling, desire.
Your desire is the confirmation
The destination is there
God wouldn't put it in your spirit if it wasn't going nowhere
So, set your sights on the promises and don't you be scared
'Cause you desire is the confirmation
The destination is there
So we need to get out of His way. We need to stop trying be right. He alone is right.