This is hilarious actually ...the game quests, quest-line, finding missing quests are easier than ever, yet people complain about the quests being hard... back in patch 3.0 tika-rik was very hard, especially for scouts, we had no bloodlust stats yet, the skill that heals you and reduces the incoming damage you get was only for the first and second trial, we had to take huge amounts of buffs (+30% hp and mp from mage, bard skill that increases you hp by 100%, etc...) and potions and it took me 12 hours just to finish that quest.
So my old painful days aside, how you can do this quests easily ?
-Get gears for yourself it will help you (astral gears or craft gear, also get some bloodlust from guild and gear stats)
-Get alchemist potions the one that heals you a percentage of your hp and another one that is call the last chance potion which heals you when your hp drops below a certain level (most of the player have alchemy as their profession if you are on the league side you can pm me/ send me a message I can make some for you, if you are on the Empire side you should find someone, it won't be that hard).
-Raise your blessing level (you can see what level do you have if you let the mouse cursor on the patronage symbol next to your character's Icon) the max level of it is your current level it gives extra vigor= more healing and damage dealt.
-like what other players listed above CHANGE your maneuvers you need to survive, not to kill mobs in the last phase, keep running use the shield only when your HP gets low, use aoe CC like scout's caltrops, all things listed above will increase you chances of staying alive = finishing the quest successfully.