[VhaalintheAssassin]

Hmmm...I am starting Throne of Bhaal (finished it many times before but long ago), and I remember entering it quite quickly. Like "Lord" said, you shouldn't have a problem with it. When finished with Shadows of Amn, your party should be strong enough to face the place. I would imagine if you can kill Gromnir and his minions, then the Watcher's Keep will be beatable--challenging (which is good anyway) but beatable. To be safe, though, I would make sure a lot of resistant spells are available, as well as some good potions, just in case...Lots of evils lurking in there...