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我申请绿卡时得到8老师的帮助。 最后，我和前夫的关系极差，我拿到绿卡时已进入分居阶段， 但是离婚还没有finalized. 现在，我想申请citizenship, 他根本不可能合作，你认为难度大吗？ 用请律师吗？ 
-Because you have got the green card more than 5 years, your US citizenship application has nothing to do with your ex-spouse.

The only question is that: did the immigrant court/judge cancel your removal proceeding before you got your 10-year green card? If yes, then you will be fine to apply for the US citizenship, and do not need a lawyer. Otherwise, you  had better not apply for the US citizenship and had better consult a lawyer if you want to file N-400.