Ever since we started directing handbell choirs, we've struggled to find music that is accessible and appropriate for worship for small groups of ringers. Sure, there are plenty of beginning pieces (Levels 1 and 2), but much of the literature calls for 15 or more bells (2+ octaves), which is hard to manage with a group that has as few as six players (especially if they're beginners). 

First, a quick word about collections: Over the past few years, we've come across a few collections that work great and pieces that are not only playable but also meaningful for all involved. Patricia Sanders Cota has written several arrangements for twelve bells (4-6 players), organized into various collections: 

Twelve Bells for Worship (Vol. I and II) 
Twelve Bells for Christmas (Vol. I, II, and III) 
Twelve Bells for Praise and Worship (Vol. I and II)