"The horses, however, all act a bit differently to the atmosphere - some in a positive way and they put in a good performances - others might get, for want of a better phrase, stage fright and not be at their best," said Steiner.
Each year, a new course is designed by designer, Australian John Vallance, who co-designed the course at the 2000 Sydney Olympic Games.
Also tomorrow evening will be the Bayleys Double Slalom with riders competing head-to-head on identical courses in a knock-out basis.
The equestrian action moves to Tauranga Racecourse for Friday, Saturday and Sunday with a variety of classes and competitions in three rings, including on Friday, the Pro-Am, the 1.20m class and the 1.30m Sweepstake, with entry fees pooled as prize money.
"Last year, it was about $1600 to win and, for those at that level, it's really good money - by far the best money in the country," said Steiner.
Saturday sees the Young Rider and Peppers on the Point 1.35m events while the main event, the Bayley's Grand Prix, plus the Farmlands/Excel Pony Grand Prix will be among Sunday's events.
As well as Steiner and her husband, Phillip, top riders to look out for include Helen McNaught, Vicki and Amanda Wilson and Katie Laurie.
Those carrying local hopes include Lilly Miller, Georgia Preston-Smith and Laoise McCarthy.
Several riders and horses have come up from the South Island and will stay in the north competing and preparing for the Horse of the Year Show in Hastings from March 17-22.
Steiner said show jumping was an easy sport to follow.
"The idea is to jump a clear round and have no disobedience from the horse - but there are also a lot of underlying skills people might not be able to see."
The Grand Prix has been sponsored by Bayleys for more than 10 years.
"We are very grateful for the support they have given over all that time," said Steiner.
The action begins at 4pm tomorrow, and 9am on Friday and Saturday, and 8.30am on Sunday.
