Couple looking to spice up love life.

Hello all.  My wife and I are interested in maybe trying this out.  Thinking about attending a club or party first to test the waters.  More like if i will be comfortable with this.  Not worried about my wife having a good time more worried about being the one being left out (  a little anxiety on my part if you cant tell).  Any advice would be much appreciated. just interested in making her happy.