There are two common mistakes Christians make
when God opens his doors:
Some Christians don't wait for God - they want to crash the doors on the run, not allowing Him to do the opening. Prayer is still a prerequisite to action.
Other Christians find that God has opened a door - through which they are not prepared to go.
Remember that open and closed doors rank very low in the list of ways of knowing the will of God. The problem with it is it's almost impossible to really say at the moment the door opens or closes whether it was God who did the opening or the closing.When we speak of a door we are talking about an entrance into something, a portal. However, what we are really seeking is a particular kind of door. We are looking for what Paul calls a "great and effectual door". It other words we're looking for an entrance into a great opportunity.
For a great and effective door has opened to me, and there are many adversaries. 1 Corinthians 16:9 - NKJV
The Holy Spirit will companion you in making right decisions. He is ready to give you the prompting you need. Often, though, He just uses the peace of God. You only have to look to the peace of God in your heart. When it's there you know the leading you have for what to do or say is the right one!
In this way you can carry on in confidence.