From the M1 take the Sprucefield Exit and follow the signs for Hillsborough/Dublin/Newry i.e. the dual carriageway.
Go along for 1 mile and at the top of the hill you will see a sign pointing right for Culcavy ( and another brown sign for Down Royal Racecourse- if you keep following these signs you'll arrive at the Church since it's just up the road from the church!).
This road is Harrys Road and is 1 mile long, go straight across the cross-roads, onto Aghnatrisk Road, which again is 1 mile long. At this cross-roads turn right - going past houses and a Methodist church and once you're over the motor way bridge you'll see the Church on your left.
In total it's just over 3 miles from Sprucefield.