Mr Guy, 31, was found dead in the driveway of his home on Aorangi Rd, south of Feilding, on Thursday last week.
A post-mortem examination confirmed he died from several gunshot wounds.
His funeral service was due to begin at 11am at the Anglican Church in Feilding.
Screens showing the service would be set up outside the church, which could hold about 300, as well as in a neighbouring hall.
A private burial at a separate location would be held for close family and friends following the service.
Meanwhile, police said they had received little information from the public regarding Mr Guy's murder, and yesterday made a plea for anyone with information to come forward.
"I'm not sure what the reason is behind the lack of response. It may be that someone [who] knows something is too scared," Detective Inspector Sue Schwalger said.
She said anyone with information, no matter how irrelevant they thought it might be, should call police.
Five road checks near Mr Guy's farm were set up between 4.30am and 8am yesterday in an attempt to identify regular road users who might have witnessed something last week.
About 230 motorists were stopped and spoken to by police, including 80 who were regular users of roads into the area.
Searchers also scoured roadsides and a nearby river to try to find the murder weapon.
Ms Schwalger said police were yet to find a reason for the murder, and were looking into Mr Guy's background for links that could have led to his death.
