In answer to your original question; yes it is simply a question of removing the gas (get this done by a professional) remove old compressor, fit new conpressor and then have it gassed up (by a professional ideally). You add the oil when it is being gassed up usually I think.
You dont need to change the drier unless there is something wrong with it.
Looks pretty simple from what I can tell. Removing the pipe to throttle body should give enough room to wiggle it out towards the airbox.
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