The most comprehensive/complete walkthrough is Dan Simpsons at
http://www.sorcerers.net/Games/BG2/index.htm
(it's the 296k file)
.
The BEST walkthrough however is SixofSpades' at
http://www.geocities.com/sixospades/bg/bgguide.htm
because it's spoiler free and a lot of the fun in BG2 comes from the story.
So for the best game experience refer to this site and if any questions arise just trust in IWF. We'll help you out if you're stuck
