[Soothsayer]

Yes, more spoilers (well, nothing too new)
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You go back, hence:

Go through IWD until you have the 6 badges and store them somewhere.
Go to Hjollder in Kuldahar and start TotLM.
Continue with TotLM until you get an offer to go to the Sea of Moving Ice, say no.
Return to the Inn in Lonelywood and speak to...some halfling guy, hell take you to do the trials.
Return to Lonelywood and finish HoW
Return to Kuldahar, get the badges, then go finish IWD.