Fallout 2, Temple of Trials is a pain in the ass: http://www.youtube.com/watch?v=c-gwaO7Rs9w
Do all quests in Klamath and The Den before continuing forth.
Remember to balance SPECIAL out, if you have 1 in a stat it can be... Well.. Horrible.
Traits as well, choose wisely.
Oh and expect to start the game over like 5 times cause you "will" mess up, either with quests, either with dialogue or with your characters stats.
And remember to download Killaps patch and his restoration project. http://falloutmods.wikia.com/wiki/Killap%27s_Fallout_2_Restoration_Project