Difficulty level of upgrading hotend

This is from the factory floor

 

Nice. I'd love to see some more detailed pics.
I assume thats a 25mm fan for the cold end? Do you know if there's an STL for the cold end duct?

 

I believe it's a 25mm I'm not sure where that stl came from. I'll see if they know. I feel like I've seen it somewhere else before...

 

I buy all my E3D stuff domestically from Filastruder. http://www.filastruder.com/

It always takes me about an hour to wire up and install hot ends. I must be doing something wrong. If you have automatic bed leveling, no need to make adjustments to height settings.