New Zealanders are expected to vote to legalise euthanasia when it is put to them to decide at a referendum on Saturday.
The contentious measure is one of two social issues being decided alongside the country's general election, the other being the legalisation of cannabis.
Advocates for the End of Life Choice Act are cautiously optimistic.
"We're not counting our chickens before they hatch," Jess Young, the executive director of the Yes for Compassion campaign, told AAP.
"But the polling looks positive. It's looked positive for the last 20 years."
The campaign has benefitted from widespread political support.
Prime Minister Jacinda Ardern, Opposition Leader Judith Collins and former PMs Helen Clark and John Key support the law change, as do the Greens.
Ex-PM Bill English is one of few prominent voices against.
The Yes For Compassion movement's strategy has been to personalise their campaign with stories of human suffering that Kiwis find relatable.
"That's the story we want to tell and show there is broad support among every demographic," Dr Young said.
The leading campaign against the change, Vote Safe, believe they've faced many hurdles in conveying their message.
"Most New Zealanders still think the End Of Life Choice Act is about the already legal option of turning off life support, thats been legal for years," Henoch Kloosterboer, Vote Safe campaign manager said.
"No offence to the public but they're ill-informed as to what they're voting on."
Mr Kloosterboer concedes it is likely to fail, pointing to a poll which has Yes support at 55 per cent and No support at 34 per cent.
He believes a lack of rigorous media coverage and the referendum's design is counting against his campaign.
"End of Life Choice Act sounds like the choice at the end of your life like one would assume, turning off life support or refusing treatment.
"It's very understandable the public aren't aware of what the law would provide," he said.
"I'm not sure how the public are going to vote but I hope New Zealanders will do their research and look at the risks carefully."
The New Zealand model is similar to Victoria's Voluntary Assisted Dying reform, enacted last year.
Mr Kloosterboer points to the fact New Zealand's legislation is 100 pages shorter as evidence it is less rigorous than the Australian model but Dr Young said the law was "incredibly safe".
"It's been debated in parliament for four years. The resulting law is rigorous with 45 safeguards to ensure there are very few people that meet the criteria," she said.
"I think it's safer and tighter than the Victorian law."
Results from the referendum are due two weeks after polling day as the Electoral Commission prioritises counting the general election results.