Apparatus and methods are provided for placing and advancing a diagnostic or therapeutic instrument in a hollow body organ of a tortuous or unsupported anatomy, comprising a handle, an overtube disposed within a hydrophilic sheath, and a distal region having an atraumatic tip. Either the input disc and output disc or the rollers, but not both, has a sintered powdered metal rolling surface. The display includes a first region that includes first rows and a second region that includes second rows. The system and methods allow prospective travelers to efficiently identify which itineraries best meet their schedules and budgetary requirements.