You can never know Entry and Holding procedures well enough.The bible for this is indeed Doc 8168. Know your aircraft type technically and procedurally, know the JAR OPS pertaining to your operation, and especially make sure you know the profiles for your aircraft type and memory checklists for various normal/non normals. In winter, make sure you have revised Icing procedures, contaminated runway ops, etc. Stall warning, GPWS and Wind shear recovery, etc. TCAS traffic avoidance procedure to name a few.
I hope this gives you a steer in the right direction.