The majority of technology projects end with some sort of requirement to change. Consequently, whether or not your title is "Change Manager," if you're an IT Contractor, change management has almost definitely formed part of your role at some point in your career. If it hasn't yet, it will.
If you find this particular topic to be a challenge, or if you'd like a few extra tips, take a look at this simple infographic from Akkencloud and Ghergish & Co. It has helpful advice for any contractor.