I am unsure as a Digital Marketer. How to come to terms with my own abilities? I have been working as a Marketing Manager for the last 3 years in a company that champions digital marketing. I recently joined a company where I had to start a full fledged Digital Marketing function. 

Things have been pretty bad here and the CEO thinks that Digital Marketing skills can be sought within 3 months through a Digital Marketing course.  

I have become unsure of my skills now and my mind is blocked. I have a target of 15% growth month on month using SEO but I am just so weak to work with focus. My confidence is gone as I only have 3 months to prove my abilities and we redeveloped the website just a month ago. 

How to cope up?