Renaming Lyra required me to write a custom tool, it generates hundreds of redirectors and renames hundreds of entries in obscure places all through the project. After that’s done, the actual blueprint content needs a fair bit of work itself even with all redirectors in place.
It is a monumental task. Michael should not have made that throwaway comment about renaming some blank project 
The answer is - if you have to ask, you’re probably not going to be able to do it. No one could possibly walk you through it.