Thanx everyone for ur advice!
Here is my party for more detailed strategies:
Me (Paladin) - lv.10
Minsc - lv.10
Jaheira - lv.9 (fighter), lv.12 (druid)
Yoshimo - lv.13
Arie - lv. 9(cleric), lv.10(mage)
Nalia - lv. 11
Am I too weak? Or is it possible for me to beat him?
Further help also greatly appreciated!