I made a little "tutorial" to illustrate how my method could work. The zip files are save game folders valid only with TotSC.
Made a human abjurer with this roll:
http://www.dsr.kvl.dk/~maddog/solo/Baldr018.jpg
which I realigned a bit to max str, dex + int, 16 in wis, 15 in con and the rest in cha.
http://www.dsr.kvl.dk/~maddog/solo/8...-SoloStart.zip
In Candlekeep I did the odd jobs. Only thing worth mentioning is that I whacked Fuller for the dagger+1 and used a bit of gold to raise my reputation, bearing in mind I needed some pennies for a scroll of invis. After that I went with Gorion to his demise, swiped Imoens stuff and booted her out.
http://www.dsr.kvl.dk/~maddog/solo/8...33-SoloEp1.zip
From here I turned directly south and bought a scroll of invisibility from Thalantyr and headed south and then west to the lighthouse. Close to the sirines I read the scroll and darted past the lot into the cave. Waiting for the golems to be in a favourable position I took the stuff and ran to the entrance. There I id'ed the book and wand and put on the cloak. Drinking the oil of speed I went out and used the wand to paralyze all the sirines. With the cloak you get 2 attacks pr round and combined with a sleep spell you are lethal. At this point the ball is rolling with 12K XP.
http://www.dsr.kvl.dk/~maddog/solo/8...34-SoloEp2.zip
Headed back the HH and sold redundant stuff to get a few spells. Mirror Image is important. Then into Beregost to clear up. Just to illustrate the power of Sleep+Wolf there's an image of me killing Spiders with no problems. Beware that some spells work in wolf-form and others don't.
http://www.dsr.kvl.dk/~maddog/solo/Baldr020.jpg
Other than that it's just the usual stuff. Miriam, Silke (used wand), Karlak (used wand), Marl (calm and kill). Then northbound stopping briefly to kill an Ogre and into the FAI. Collected the RoW, killed a bounty hunter and some hobgoblins. Returned a lot of loose items and sold junk. At this point we are 400XP short of level 5. Soon to be remedied.
http://www.dsr.kvl.dk/~maddog/solo/8...35-SoloEp3.zip
Back south of HH I killed Zarlaks crew (sleep) and Bassilius (sleep resistant - memorize some magic missiles). Picked up and cured Melicamp and headed out to the temple to collect my reward. At this point we are about 10 days into the game with almost 25K XP. This concludes the small tutorial.
http://www.dsr.kvl.dk/~maddog/solo/8...36-SoloEp4.zip
Next buisness could be the basilisks for even more easy XP. Or the reward could be used to recharge the paralysis wand and do the vampire wolves. It's a plain game from this point - you have plenty of spells.
Bear with me if you find this overly redundant or otherwise foolish.
Your THAC0 is incurably poor in wolfform, however the extra attack makes it very good against temporarily immobilized enemies. A plus item for a solo wizard.