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Deploying DMARC can be anything from a 2 min. task, to a project taking years to complete, depending on the size and complexity of your organization.
If you can provide more detail, more specific advice can be given.
Take a look at this comprehensive guide to implementing DMARC/DKIM/SPF: How to implement DMARC/DKIM/SPF to stop email spoofing and phishing.
It provides step-by-step instructions and explains how DMARC, DKIM, and SPF work to achieve effective email authentication.
I followed the steps at https://dmarcguide.globalcyberalliance.org, it asks questions and gives you the value for your TXT record. When I tested it, it said it worked… so I guess it did!