I was recently appointed manager at a large international company and one of the main tasks I have been entrusted with is appraisals. I have to admit I am not very comfortable doing them as I have never really seen their worth when I was the one being appraised. 
I will also be reviewing the performances of my own former colleagues. I do not want to be too critical of them, but I really don’t have any choice now that I am in a manager’s role. How do you suggest I go about the task?