While some aspects of modifying a visio template made for use with D-Tools can seem pretty straightforward, most of it is not.
See this thread and others associated with it:
http://d-tools.us/showthread.php?t=1651
Sidenote, as long as you only work with one paper size and one drawing scale things are simple. changing either of these can cause all sorts of scaling issues in the d-tools visio templates if you add your own geometry and/or logos...