Participating in a worship team on stage during a church service is itself an act of worship - but not how you may think, and certainly not in the same way as that of the congregation.  Playing on a worship team is work.  Your service and effort put towards a professional quality is your worship.  Your role is different than that of a congregation member, and so is your worship. 

It is a wrong assumption to think that worship leaders/teams are worshipping in the same way as members of the congregation.  Congregation members, like most audiences, will feel the way you as a performer look like you feel.  If the praise team all have solumn expressions on their faces, it will affect the mood of the congregation - regardless of the feel of the music.  If you miss a note or start a vocal line early and this causes you to lose your composure (instead of calmly ignoring the issue), the congregation will feel the awkwardness you feel because that is what you are showing them.

Worship teams are worshipping well when they are demonstrating worship.  This demonstration of worship comes from a commitment to excellence and professionalism on stage and in rehearsal.  This commitment to excellence comes from the musician’s acknowledgement of their talents as gifts from God and the music as worth playing because God is worth it.