Having demolished our local WOC player on numerous times, I can advise you on doing the following:
1. Lore of Metal: This lore is a must against WOC period, don't let anyone tell you otherwise, WOC like armour so does Lore of Metal
2. Skink Skirmishers: Use these fellas to poison his mauraders to death, and march block.
3. Terradons: These guys are brilliant, use them to bomb his uber unit just to annoy him and march block his units.
4. SLann: You really need this dude, since he has no magic, you will destroy him in the magic phase period. You may want to take Temple Guard with him.
5. Saurus: Two blocks of at least 18 (6 wide x 3 deep) with spears, for when he eventually reaches you, if he does survive your magic phase in good shape (which he won't). The amount of attacks they will generate is just amazing.
6. Try to spread his army out and destroy it piecemeal, most WOC players I played against like to stick close together for support but once they are seperated you'll be surprised how easy they are to defeat
I know the above is easier said than done but don't be intimidated by his army, WOC without magic support is a sitting duck for Lizardmen, I'm going to cast Rule of Burning Iron against your BSB, look rolled a six, do you want to dispel what no dispel scrolls or dice what a shame, oops BSB has no armour save, goodbye
