This guide presents steps to implementing human immunodeficiency virus/sexually transmitted infection (HIV/STI) programs in schools, faith communities, AIDS service organizations, and community based organizations. Eight chapters are: (1) "The Need for HIV/STI Prevention Peer Education" (including research findings on peer education); (2) "Building Support for a Peer Education Program" (the importance of laying the groundwork, reasons why teens need HIV/STI education, and arguments to counter possible opposition); (3) "Planning the Program and Finding Funding" (comprehensive planning, budgeting, and finding funding); (4) "Selecting and Training Staff and Recruiting TAP Members" (important qualities to look for in recruiting staff and guidelines for recruiting youth); (5)"Training Youth To Be Peer Educators" (outlines 12 sessions that amount to 22 hours of activities); (6) "Youth Developing Activities To Educate Their Peers" (educational efforts that peer educators can design and implement and approaches to supporting those efforts); (7) "Evaluating the Peer Education Program" (guidelines for assessing program success and a sample evaluation instrument); and (8) "Taking the Message to the Media" (guidelines on how to interact with the media). Two appendixes present resources and useful forms (e.g., sample permission slip, activity planning sheet, and consent to use photograph). (SM)