DMing Tomb of Horrors soon - any advice?

[DNH]

In about a month's time, my group will begin the Tomb of Horrors 4e super-adventure and I was wondering if anyone has any advice, suggestions, dos or don'ts. The party consists of just three characters and I have already adjusted all the encounters accordingly.

Thanks.

 

[the Jester]

The lamia in the Garden of Graves is really rough, what with its swarm traits.

 

[Dragoslav]

Horror will be your most valuable weapon. Is it in your heart to be.... horrible?