I’m sorry for the delay in responding! Please post anything that needs a response in Problems & Support, otherwise it probably won’t be seen for a long time, if at all.
We are just providing the parts. It’s a process that’s straightforward if you’re experienced maintaining laser equipment (and not much different from other devices), and very difficult if not. Given how you framed the question, I’d say - there’ll be someone with the skill to do it nearby, but it may not be you.
At the outset, we won’t be providing instructions because we’re not sure it’s possible for a nontechnical person to install them successfully. Sadly, if we provide instructions, we’re liable and responsible for people using those instructions successfully, which is a barrier we don’t know yet if we can clear. It’s like a car manufacturer selling engines for the cars they produce - they won’t tell you how to install it because they can’t be responsible if you don’t do it right.
That said, I believe the software team has tools to make sure the power output calibration’s properly updated - I don’t know the details but I believe the plan is that you email support the tube’s serial # after it’s installed and the new calibration data is loaded for you.
I want to be conservative here because I know the stakes are high. Unfortunately that means if you are only interested in your Glowforge if you can replace the tube yourself, and you haven’t replaced a laser tube before, I’d have to recommend either waiting until the first customers opine on how tube replacements go, or cancelling and obtaining a refund.