If Sinn Féin, the Green Party, the Social Democrats and others are to thrash out a programme for government in the coming weeks, there will have to be give and take from all sides.
Sinn Féin has made it clear it will push for policy changes in the areas of health, housing and childcare.
A freeze on rents is likely to be the central plank of a programme for government hammered out by these parties, as well as an ambitious plan to build tens of thousands of social and affordable housing units.
The rent freeze may be a controversial policy but it is not credible for any of the parties who may be part of this left-wing, non-Fine Gael, non-Fianna Fáil government to drop it, given they all voted for it in the Dáil just eight weeks ago.
Ending the recruitment embargo in health and pledges to fund the cross-party Sláintecare plan and deliver more money for the provision of childcare are also likely to form a key plank of this programme.
Other commitments in the Sinn Féin manifesto will inevitably fall victim to compromises with the Greens. Sinn Féin pledged not to increase carbon tax, but this is a central plank of the Green manifesto.
"I would say that climate change is a very important issue and the Greens have a significant mandate there. I don't see that being a barrier for us," said Sinn Féin TD Pádraig Mac Lochlainn of possible increases in carbon tax. "Health, housing, childcare and putting money back in people's pockets. Those are crucial for us."
Sinn Féin could conceivably agree to the Green Party's manifesto pledge to increase carbon tax to €100 over 10 years but redistribute the revenue into people's pockets via social welfare increases and tax credits.
This is what compromise and deal-making is about and Sinn Féin knows this better than most, having been involved in some negotiating in Northern Ireland over the past 30 years. Even in its most-recent talks to restore power-sharing it compromised. Once upon a time it was demanding that DUP leader Arlene Foster step aside over the RHI debacle. Now she occupies the office of First Minister with Sinn Féin's Michelle O'Neill as her deputy.
The Northern influence on the talks to form a government in the Republic is already evident with O'Neill and other senior Belfast-based figures including Conor Murphy and party chair Declan Kearney in Dublin for an ard chomhairle meeting on Monday night. Gerry Adams was also seen at the offices of the Communications Workers' Union where the meeting took place. But it will be Pearse Doherty who leads the negotiations, assisted by Eoin Ó Broin, Louise O'Reilly and Matt Carthy. They will report back to Mary Lou McDonald and the ard chomhairle.
Sinn Féin's priorities, as outlined by Mr Doherty outside party HQ yesterday evening, include "preparing for Irish unity".
Ms Foster hit back strongly yesterday, saying the circumstances for a Border poll do not exist in the North. Her comments were reflective of an anxiety within the DUP about the possibility of a Sinn Féin-led government in the south.
Its main concerns are the sudden domination the party would have of cross-Border institutions. "There are protections in the system but it would be unionists having to invoke them. It would put confrontation into the system when limiting and reducing those would be more advantageous," a DUP source said.
It would also inevitably intensify talk across the island about a Border poll which frays unionists' nerves.
As Sinn Féin focuses on talks with the Greens, the SocDems - who remained suitably coy last night - and other left-wing groupings in the coming days, Independent TDs are tentatively dipping their toes in the water around possible Dáil alliances.
Former Sinn Féin TD Peadar Tóibín reached out to Kildare South TD Cathal Berry, a former Army Ranger commander, via a Twitter private message. He has also held talks with others.
Meanwhile, Fine Gael was making plans for a parliamentary party meeting on Monday with a strong view forming that opposition is the best option - although senior figures think they could step in if the Sinn Féin-led initiative flounders.
Certain Fianna Fáil deputies and party figures hardened their anti-Sinn Féin stances last night. A senior party source stated: "We will not be going into coalition with Sinn Féin. They want a left government."
Asked what the future holds, one relieved and re-elected Fianna Fáil TD responded: "Marxism."
But the feeling is mutual. Mr Mac Lochlainn suggested there would be huge problems for Sinn Féin grassroots to govern with Fianna Fáil under Micheál Martin, who demonised the party during the election.
New TD Réada Cronin said: "I do not trust Fianna Fáil."