Auditors are not allowed to audit their own work

Am I allowed to lead and manage the internal audit, despite that I am the one who writes the ISMS documentation and am the project manager of the whole ISO 27001 implementation?
I ask because of the sentence: "Internal auditors must be selected in such a way as to ensure objectivity and impartiality, i.e. to avoid conflict of interest, because auditors are not allowed to audit their own work."
 

Answer:

No I am sorry, your approach is not ok for the standard. The recommendation is that the internal audit be performed by a person who is not related to the implementation of the ISMS (on this way, you can ensure the objectivity and impartiality). One option is to search an external company, but another option is that the internal audit be performed by an internal employe of your company. This employee need to have knowledge about ISO 27001 (maybe you can train him) and of course, he need to be not related to the implementation of the ISMS. Furthermore, this article can be interesting for you "Dilemmas with ISO 27001 & BS 25999-2 interna l auditors" : https://advisera.com/27001academy/blog/2010/03/22/dilemmas-with-iso-27001-bs-25999-2-internal-auditors/ 
And also our toolkit related to the internal audit can be interesting “ISO 27001/ISO 22301 Internal Audit Toolkit” : https://advisera.com/27001academy/iso-27001-22301-internal-audit-documentation-toolkit/
Finally, can be interesting for your company our online course “ISO 27001:2013 Internal Auditor Course” : https://advisera.com/training/iso-27001-internal-auditor-course/