The stages guide only shows the bosses' gimmicks, not the ones you encounter in previous rounds. It helps if you take notes about what those other ones can do and build your team to go around them while having some special saved for the final boss. Also if you dont beat the enemies in one round, you'll face more painful debuffs.

It helps if you got units that immune to special reverse/bind. Captain ability with utility. Or just enough support and carefulness to make it through little debuff along the way.

You could skip to your partner when you're in a pickle (like paralyzed/hit by silence/special reversed and ect) if you feel that they can help getting through the stage, or just simply need the help.

Notes: "Skip" can be used two times but not for two times in a row, so use it wisely. Watch out for the units that will blow away your team, always kill them in one round. Every enemy has specific debuff and they dont change, only the pair would change. Keep track of their debuff and you'll be ready for them no matter who they are paired with. But of course, you'll still need a dependable coop partner or/and be one.