Colossians 1:9 (NKJV)
It is one thing to know what to do and another thing to know how to do it. For example, you might buy something at a store that requires you to put it together once you take it home. You have seen the item in the store so you have an idea what it is supposed to look like. You take your purchase home and open the box only to discover that there are no instructions for putting your item together. You know exactly what you need to do, put your purchase together, but you don't really know for sure how to do it, there are no instructions. This would certainly be a problem.
One thing that people ask me over and over is about how to find the will of God for their lives. This is a good thing to want to know because as children of God we should want to please God and do His will. But, knowing what God wants you to do is just the first step. Once you know what to do you then also need to know how to do it and even when to do it; you need the wisdom and spiritual understanding that is referred to in Colossians 1:9. The good news is that God not only wants us to know His will but He also wants to help us see how to do what He asks and also the best way to do it.
We may know what to do but we also need to have the full understanding of God's will to know how and when to best do it. We have the written Word of God, the Bible, and as Christians we have the Holy Spirit living in us. Sometimes the way we know how to do what God wants us to do and the way He wants us to do it is simply through seeing what the Bible says and sometimes it comes to us through the direction of the Holy Spirit. Ask God to reveal His will to you through His Word and by the Holy Spirit and trust God for the wisdom and spiritual understanding about how to carry out His will.