Death Knight is quite hard thats why it might be not that easy for you. (but if you master the game mechanics and skills, its easy).
You can try my way, Go for Shadowblade solo Lone Wolf Fane, you cant imagine how much fun it gives.
You go Finesse/Wits build with full Scoundrel (and 1 Polymorph for Cloak) and then some Warfare/Dual Wielding (You can swap warfare with Necromancer for healing)
Pick Lone Wolf and The Pawn perks (pawn is very impotant)
Playing Fane gives you 2 very good special abilities, Time Warp (2 tours instead of 1) and Playing Dead (another free tour)
The amount of movement from maxing Scoundrel and The Pawn is insane, you actually dance in the fight places.
Playing with enemies with Invisibility (Chameleon Cloak) and Playing Dead (special skill) is so damn effective, before enemies can even hit you you already did 3 full tours (4 if got source for Time Warp).
Remember about picking everything thats worth any gold, selling it and buying good items, this is essential as Lone Wolf since you need the best equipment you can get.
Insanely good, i recommend it