Hey Jennifer...yes it can be that easy.  Here are some things I'd suggest.  Explain what Help-Portrait is and it's purpose.  In fact, one great way is to direct them to watch the video Jeremy and Kyle have put on the website.  Most people want to know who they are allowing into their "realm" to meet with their people before giving full access.  Especially because you will be getting each person's name for the sign-up sheet (read the documents on the download page).  If you can participate on Kauai that would be so awesome.  I don't know of anyone there that has done it if it has indeed happened.  Keep it up!