If you lead a small group study, you have a servant's heart. As a group leader, your desire is to develop this same heart in the members of your group.
How do you build a muscle? You build it by using it. Similarly, you need to build the servant's heart by working it.
One way to do this is by rotating leadership. Think about the gifts and abilities of your group members. At the end of your meeting, ask him or her if they'd be willing to facilitate your next meeting. Point them to all the leader helps and reassure them that it's just for one meeting.
Another thing you can do to develop a servant's heart in each group member is to take on a group service project. Your pastor is probably up to his eyeballs in responsibilities. Your group can exercise a servant heart by volunteering to do something to help out the church. Just phone the church office and find out if there's something you can do for him for a couple of hours on a Saturday. You'll have a great time, it will draw your group together, and your heart muscles will be a little stronger.
Remember, the more your group sees you relate to them out of a servant's heart, the more they'll want to do the same. Don't worry about being the perfect leader this week. Just look for ways you can serve and love your people, and believe that they can grow as servants of God.
The Bible says God gives grace to the humble; as you go before him in humility and seek his guidance for this meeting, you can be confident of receiving his grace.