1. Not to accept every MotH and Promising General - dude, only Sharp/Charismatic/Vigourous ones, or if it fits in some other way into your roleplay.

2. With non-celtic or -germanic factions: no fullstacks

3. With barbarian factions: at the beginning not too much tactical moving, just go forward and slaughter them or get slaughered (of course you try to ambush and stuff)

4. don't just conquer everything for no reason but wanting to rule the world. Think of good reasons why to attack them, defeat them and then bring peace to your land. Dispand parts of your army (they want to go home) and just keep 1 regular defense army back, and wait until you get attacked or RP some other reason after a couple of seasons, to attack another city. Recruit new armies etc.... Mainly: Don't go ahead and roll every region, one by one, down.

5. RP civil wars