1) Don't trust any Enneagram tests (since each time I took it I got 8<3<1 (EDIT Whoops I meant 8>3>1 -- why do I always mess up those Vs?!), which is totally wrong), and
2) Regarding the bolded: make sure they REALLY know you well (since I made a "type me" thread and remained mistyped as a 6 for months!).
What I did was only rely on descriptions online -- and there are only certain ones that I like. The enneagram institute ones can be misleading, from my experience, but enneagram.net worked wonders for me.