I've done this but you must have a resource to parts appropriate for your machine, along with diagrams.
There is no way to respond with exact instructions for you in this forum but this task can be accomplished with simple household tools.
The best advice is to disassemble the components, making notes about the sequence, and only after getting manufacturer's information. You replace the belt and reassemble.
Above all, be reasonable in your expectations of your own ability to avoid frustration. Study the problem and proposed solutions thoroughly and be prepared for venturing into the unknown.