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Hello, there are no documents showing demolition of any of this, however I have taken apart many systems in 56 years and can coach you how its done step by step.
Start by using the 'add files' link next to your send button in your reply box to send me several photo's of the tank and its air vent/ drain valve, we can go from there.
click here for a video, the last part shows the B and G drain O Matic valve that is most likely in place aleady
The first part of the video shows my friend making his own drain and air vent valve out of a tee and a hose bib and poking a 3/8" copper tube up the tee to vent air into the tank, Look at the entire video it will start to make sense.
Drain O matic air charge valve, used to drain those tanks
If you rate that answer positively right now, so that I do not loose my shirt training and coaching you to a solution, I will hold the question open for you on an unlimited time basis!
Draining the tank is the first step to removal.... after its drained the water line connections can be cut and the tank removed by removing its hanger bolts however they happen to be installed at the time.
Simply drain the tank, then of course do not refill it....with the tank drained removal is just a matter of cutting or disconnecting the pipes and lowering the tank. You may want to rent a 'Hy Jack' at a local tool rental to help you lower the tank.
This sort of like digging a ditch, just a shovel, the rest is obvious.
There is no telling from here how the installer chose to attach the tank to the ceiling.... you can however take a look, you will see what he did, then just remove the hangers.
Some tool rental stores will have a manually operated high lift, sort of a small fork lift on caster wheels that you can use to lower the tank.
Yes, drain the radiators as well, some will have drains at the radiator, most will be drained from the piping in the basement. A person just does the best he can. and copes with any residual water that might be in the pipes.
Be sure to find the city water feed line to the boiler, make sure that valve is turned OFF.