I'm loving this game again! Definitely helps to have finished it multiple times on console, I had forgotten how difficult it can be at times.
Currently at level 25 and I switched from Sorcerer to Assassin last night. Pro tip for the newcomers: the Vocation you have active determines how your stats will level. E.g. If you play (and level up) as a Sorcerer your magick attack will go up with each level and for a warrior your physical attack will go up etc. Also, augment skills are not locked to a specific Vocation, once you have the skill you can change Vocation and still use the augments from your previous Vocation. The same goes for core skills, provided you can still use the weapon the core skill is tied to.
My pawn maxed out the Strider Vocation but I will probably switch her to a mage for the healing and buffs. Another pro tip: make sure you have at least one pawn with Anodyne (basic healing spell) and Halidom (cures most debilitations like silence, poison, etc.), or the higher versions thereof, in your party at all times. Another good idea would be to buy healing potions and stuff for all types of debilitations. Trust me, you do not want to go fight a Cockatrice and get petrified only to realize you need a potion to cure it or it's game over in a minute or so.