Anyone can handle their immigration process on their own. Some may succeed but some also fail. The entire immigration process is very stressful and complicated which is why most people prefer to seek help from immigration lawyers than doing it on their own.
When a marriage goes through a lot of obstacles, both parties tend to end up filing for divorce. This scenario is very common in the United States as many couples who have even the slightest misunderstanding resorts to divorce in just a snap.