print $result->get_subscribers()->get_Subscriber().[1]->get_firstName; But I just get the error: .... Do I need to bless the array objects - please help!

You in essence have print [1]->get_firstName and [1] is not a blessed reference.

You probably meant to write

print $result->get_subscribers->get_Subscriber->[0]->get_firstName;
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or

print $result->get_subscribers->[0]->get_firstName;
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or

print( ($result->get_subscribers)[0]->get_firstName );
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or some such :) I can't really tell because I can't run the code.