In the case of Barnabas and Saul, God’s calling was to preach the gospel…in your case it may be something entirely different…but the correlation is the same in that the calling comes first, then the setting apart. And depending on a myriad of things, the timing between one and the other can be short or long. Sometimes the Holy Spirit will place a calling on our heart and immediately will spring us into action…while other times, there is a long period of equipping and preparation on our part before He says, “Yes, the time is now.” It’s during that long wait that we tend to question our calling…but regardless of how long it has been, know that the Lord has not forgotten…He’s still at work, perfecting you, until the time when He will separate you for the work He’s called you to.