I am always reluctant to do civil wars, I am not very good at that ! How do you organise your armies and political factions, if you can enlighten me?
Politics: Try to lower Landowners powers without making them radicalized.
1. Get landowners out of the government and put Rural folk into. Spend 200 authority to oppress landowners. Spend another 200 to intelligentsia backing up. (why rural folk?= they are supporting professional army and agriculturalism. You won't need to rebuilt your government again and again to even discuss this laws. (rebuilting the government creates radicals out of the thin air.))
2. Remove landowners from the bureaucracy. This is -25% political power loss for them.
2. Switch to professional army. Another - 25% political power on Landowners. This will also make army faction extremely happy for some time. Their loyalty gives 10% offensive and defensive which is very useful.
3. You should remove landowner generals and admirals to lower their political power. (You can do this in the beginning. Make sure you won't trigger civil war before switching to professional army.)
4. Abolish slavery. This will make landowners rebellious. Start the debating law the moment professional army enacted. So you can use Army faction loyalty perk.
5. You can try to get into some defensive pact but you don't have to. Its just make things easier.
Army:
1. You need army quality. To achieve that there is a couple option. Better weapon / loyal army. You can try to build weapon factories their productions are not expensive but their construction cost is very high. It will delay raw material industry. The easiest way to acquiring them is entering custom unions with France/Great Britain.
2. Remove Kars barracks. It is harmful (not even useless) Build some in balkans if you can. (They only cost 50 construction. You can easily spam them. However you need to wait their employment rate is fulfilled. (BTW built everything in balkans. When civil war starts you will lose access to Anatolia.)
3. make sure your infantry quality is level 2 and artillery is lvl 3. Make sure you can acquire enough weapon and artillery. (Also switching equipment give %100 penalty to your army. Switch equipment 1 year before the civil war.
I hope this helps. Enjoy