Once I got into therapy and had a better understanding of the function of my alters I was able to hear them as individuals. Not so much voices but thoughts. When I felt feelings of anger for no apparent reason I started by asking "who is so angry?" Or "who is so sad?" if the feeling was sad. Everyone used to talk over everyone so in the beginning I had to really listen and (the hardest part) accept that this was happening. Once I could hear someone trying to answer my question the acceptance part became natural.
The other most important thing is I found a therapist that had a history of working with DID patients. This was important for me because I am able to function in everyday life most of the time so I didn't want to be misdiagnosed and given drugs that would effect my employment and such. So my suggestion is work with your t and talk to your thoughts and see what happens. And always keep in mind if you have DID it happened to save you. So in some way they are actually trying to help you they just sometimes are stuck in time so their suggestions and actions no longer fit present life. Take care