New Zealand Law
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You should be able to do this at a distance. If you instruct lawyers in Western Australia, they will be able to take all the necessary steps. There are a number of possibilities, but most documents can be sent by courier which if sufficiently urgent can be overnight. You haven't mentioned whether you are briefing a real estate agent, but the similar requirements would apply. You can of course use Skype to have a discussion with your lawyer or even the old-fashioned way of a telephone call as well. And it is easy to send money from Australia once the sale is completed.