"I suppose we're going down there being pretty realistic. If we can finish middle of the table it will be good," said Spence.
"As a team we play fairly structured hockey. I think our defence is our strength."
Wanganui U15 will work towards wearing down their opposition while looking to slot a couple of goals themselves. They have played a number of warm-up tournaments, including last weekend at Gonville Domain.
Wanganui beat Manawatu 3-1, lost to Wellington 2-0, but rebounded to hold off Hawkes Bay 1-0.
Spence coached most of this team as the successful under-13 squad last year, who won the regional Curtis Cup.
He said there is good competition within the whole squad with all being capable of making the starting lineup. The nationals will consist of four pools of four teams, followed by the knockout playoffs.
Wanganui is drawn with Waikato, Thames Valley and North Otago.