Just like against VC its very important to destroy units completly against TKs. Just like their blooddrinking counterparts they will rebuild the unit you spent a while decimating. Focus fire!
Harrass Lich Priests just like MidnightSun wrote. There are probably 2 or 3 in a normal army. If you have things that can suicide-charge a unit with a Lich in it go for it, the reward is almost always worth the cost. Even more so if the Lich is the Hierophant of the army, killing him will make the army crumble, just like when the general in a VC army dies
Prepare to be dominated in the magic-phase. All TK magic works roughly like boundspells so they cant fail casting them, and almost all the Characters in the army can cast atleast one of them. Scrolls aint gonna help in the long run against TK. More DD will tho, and if you can get +X on your dispelrolls it might very well be worth that against TK. They produce quite many 1/2 PD spells each turn
Try to think ahead when the TK starts casting his spells, you will most likely be forced to let a spell or 2 go through, try to make that the least harmfull
Try to include some fast element in your army, heavy cav or similar. Thanks to predictable magic a TK army will have quite a sweet time against armies they outmanouvre. If you can stop the right spells and have something that can charge back youre in the game. Also remember that Undeads only can "Hold" as a charge reaction unlike mortals that can flee
Fear/terror-causing units and units that are ItP are naturally alot better against TK then average units. Just like VC quite a few of the TK units rely on Fear-outnumbering to break opponents, thats hard if you ignore fear
Also dont be devastated if the first time against TKs goes to hell. Its an unusual army with an unusual playstyle and a unique magic system. Practise makes perfect here