"Landing pages, videos or interviews are so called Vanity MVPs or smoke tests" - couldn't agree more!
Read this article for more practical advice. Especially the process for identifying your riskiest assumptions.
Great list of growth hacking tactics organised by Pirate Metric stages
There will be dozens of tactics which you can action right away.
In issue 7 I talked about the fear of shipping. Large corporations also have this problem.
"Innovation means experimentation in searching for a business model. Often failure is the norm not the exception."
So as I mentioned above, get used to running lots of experiments and failing.