[exim] Exim and FreeBSD

I just got a freebsd box - and would like to try exim on it (I've been
an exim user for 3 years on 2 rh and 2 deb boxes)

I'm hoping someone can help me here with my migration...

There's an exim port, I think i understand how to install it...

But do I have to do anything special to remove sendmail ?

And is there anything else I should know?