A garburator will be usually connected to a drain pipe on an adjacent sink or a dishwasher. Both these lines must be disconnected from the device. Only then can the plumber proceed with unscrewing the garburator from the mounting brackets and a snap ring underneath the sink.
Of course, completely removing the garburator is not the end of your task; the sink must be returned to normal operations. A Barrie plumbing specialist like a professional from established companies such as Harris Plumbing Inc. will most likely install new drain piping once the machine is out of the way. Note that an experienced plumber has the right materials and skills to get the job done in no time at all.