You can do either way. I always use triggers that correspond with a waypoint in the destination module. With this method you get that nice overhead sign as you are walking letting you know where you are going.
See this tutorial. http://www.lucasforums.com/showthread.php?t=145870
For the triggers you need to edit the .git file to create the trigger area. You also need to create a .utt file, trigger, to correspond with .git entry.
Waypoints are nicer. All you need is to enter the waypoint info into the .git. I've found that an actual .utw file is not necessary.
Hope that will get you started...let us know if you need more help.