Yeah, should do!
Yeah that’s right, though you probably want that most of the time, especially if you’re using movies instead of loading screens 
It will work if you are in a PIE session and type ‘OpenLevel’ into the console though, and move to a new world during a PIE session.
I’ve made it as simple as possible and explained all the steps as best as possible without being pedantic, you can pretty much copy-paste the code. I would suggest following some other basic C++ tutorials if you still aren’t confident, since this isn’t really a C++ tutorial as such.