Hey Rude, (on Beatles melody
)
I changed my solo fighter to barbarian asap, because in all aspects it's superior to a fighter, and the quest is very easy, esp. for a soloist.
Then you can pick locks, disarm traps etc. Enough time to change to ranger after that. (That was my third role, to get cure poison and cure (disease).)
Most annoying problem for a solo fighter: no light spells until after reaching the second town. So turn up the gamma for those dark spots!
Have fun!