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No to steps 1 and 2.
You score the neck while it is under vacuum. The fine crack will allow air to very slowly seep in over minutes (or hours) to avoid blowing phosphor off the screen.
The base, neck and gun are removed in one piece. This is the easiest part of the process.
Attaching new flanged neck glass, inserting a new gun, sealing the button base - that all requires experience and skill. You can see all this in numerous videos out there.
Then, put it in the oven and heat.
Next, pump out the air, seal off the exhaust stem.
Slowly cool the CRT over hours to relieve stress.
Blast the getter - not sure if you do this while it's hot or after cooling.
Activate the cathode.
Check for glass stress with polarizied viewer. Check for leaks leaks if needed.
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