1. install Eclipse Indigo M6a JEE bundle from here:

http://www.eclipse.org/downloads/packages/eclipse-ide-java-ee-developers/indigom6a

2. fire it up, then add this URL to Eclipse's list of available update sites:

http://download.jboss.org/jbosstools/updates/development/indigo

3. disable all other URLs except that one plus this one:

http://download.jboss.org/jbosstools/updates/indigo/M6/

4. select all JBT features, install everything (or just the features you want).

5. restart when prompted.