How hard was it in combat spec? Also how geared is your rogue? I've been thinking about soloing Lich King but I wasn't sure if the self healing would be good enough to beat his damage.
Wasn't very hard to be fair, you just have to save your defensive cooldowns for Soul Reaper as it really starts to hurt towards the end, make sure you FoK the frost orbs during the transitions and save cloak/prep & feint for P3 to soak the spirits.
I'm at 499ilvl, which you can see on eu armory under "tiitch", I bet it could be easily done with lower ilvl though.