I know this pain all too well and I know exactly how you feel. It is extremely difficult to put on a brave face when dealing with the handling the death of someone so close to yourself. Having to go through all of his belongings, deciding what to do with what, is not a task I would not wish on anyone. It is painful and seems to take forever. However, there are a lot of good memories in those belongings and it is those memories that are a person's immortality. So long as you remember him, he will live forever in your heart and soul.
One step at a time is all you can do. It has been seven years since my father passed away and we still have not moved all of his belongings anywhere. It's just too painful to do so. I and so many others know your pain all too well. Hang in there.