Generally refridgerant gases are not too nice for the environment (especially the older types) and therefore there are regulations in place dictating that you are not allow to discharge them directly to atmosphere. The proper thing to do would be to go to a car aircon place and have them discharge the system for you. Not sure what it costs but is the right thing to do.
After the system is discharged its basically undoing nuts and bolts (and hose connections). Just be aware that there could still be a little oil in the system that drains out when you disconnect the hoses.
Glen
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