Elektra Deliciosa Rebuild - Final Steps?

[Fredomatic]

I recently descaled, cleaned and rebuilt my machine with new gaskets and components. I spent a lot of time cleaning, scraping and scrubbing to get all the bits of scale off. I've never done this before but I've restored a few vintage things. I enjoyed learning how everything goes together but I'm inexperienced with the reboot. Is there a list of final steps before turning it on and pulling water into the boiler? The last bits were installed after these pics were taken. Any help would be greatly appreciated, thanks!

[Fredomatic (original poster)]

I get it, it's an impossible question but there must be a pre launch ritual, voodoo dance or gold code used by baristas just before turning over a new machine for the first time since rebuild. Spectacles testicles wallet and watch? Fill the boiler and prime the pump. Any other things to look and listen for? Don't be shy. For the record books, we all need to know.