Keith,

In 1914, the government, Unionists and Nationalists agreed and passed the Home Rule Bill with a large majority, with no suggestion of permanent partition.

Had there been no Easter Rising and had the Nationalists kept faith with John Redmond Ireland would have got Home Rule in 1919, probably with the previously agreed temporary arrangement. Both parties then would have six years to arrive at some sort of working compromise or some alternative solution and Ireland would have gained its independence in 1931 under the Statute of Westminster and not one drop of blood would have been shed.

RTE - Chronology of the Easter Rising

Fires in Sackville Street:
Monday 24th April, 1916
15:30 Looting starts
20:30 Looting continues in Sackville Street, and fires also begin breaking out in premises on the street.

No artillery at all in Dublin at that time and it was the looters who set fire to the buildings.

Tuesday 25th April, 1916
Reserve Artillery arrive during the morning from Athlone
15:00 British 18-pounder artillery based at Grangegorman Asylum opens fire on rebel positions in the Phibsboro area.
20:15 British gun yacht, the HMY Helga has entered the Liffey and fired at Boland's Mills damaging the upper storeys.