Can I do SOC 2 without an auditor?
Short answer
No. A SOC 2 report can only be issued by an independent, AICPA-licensed CPA firm. You can prepare entirely on your own, but the attestation itself must come from a qualified auditor.
What you can do yourself
Readiness, policy writing, control implementation, and evidence collection are all things you (or a consultant or platform) can handle without an auditor.
What only an auditor can do
Independence is the point of the report. A self-produced 'SOC 2-style' document is not a SOC 2 report and won't satisfy buyers who ask for one.