Do more side quests. Those trolls are nasty early on. Level yourself up through side quests before taking on the main quests. A couple tips -
- Enemies in this game do not scale to your level. Some areas are just a lot harder than others. You will likely encounter enemies in this game that are too difficult for you to beat. Often your best bet is just to run and come back later. Enemies in dungeons don't respawn, so once you kill those ogres they are dead for good.
- Speaking of dungeons, don't be afraid to do them in parts. Keep a portcrystal handy and lay it down outside of every dungeon you go in. Then when you have exhausted your resources in the dungeon teleport back to town, level up, restock, hire new pawns and teleport back. It sometimes took me two or three journeys to clear out a dungeon. Be patient.
- There are I believe a half dozen notice boards in the game. Make sure to pick up every quest on every one other than the escort quests which you find on the boards at the inns in Gran Soren and your home town. The vast majority of these quests simply involve killing X number of enemies. Outside of the one for killing rabbits you are going to be killing these enemies anyways so just pick up the quests and you'll finish all of them as you go on. And with each success you get money and experience.
- Pawns are key in this game. Using the right pawns in the right situations makes all the difference. In addition to their core abilities, make sure to choose a pawn familiar with the quest you are on. They'll have some symbol by their name I don't remember right now to let you know that. A pawn isn't going to know out of the gate how to defeat a troll. But if the pawn has completed the quest already then he or she will know that fact.
- Another thing which isn't made super clear is that you have separate vocation levels in addition to your overall level. Each vocation has unique perks that you can buy when you hit a certain level in that vocation. Once you buy these perks you can use them even if you switch your vocation later. So I would suggest doing various side quests with different vocations to unlock their individual perks. For example, some of the stanima perks related to archery are super valuable for every class in the game, as is their perk for taking less damage when falling from high heights. Warrior perks often increase your health or lower the damage you take, while many mage perks will lower the damage you take from spells or certain elements. Mix and mach these abilities to improve the class you want. If you are playing a tank getting increased stanima and magic defense can mean the difference between life and death. You may have to play a class you don't enjoy as much but it is worth it.
- Finally, let me mention that the specific quest you are on is the most difficult quest in the game I have yet faced. The trolls are nothing compared to the ridiculous battle ahead. If a troll can take you out in one hit you are not ready for this quest. You need to go do side quests for another 5 to 10 levels and you should spend many of those levels as other classes.