Winning the toss and batting first will be crucial to the Blackcaps' chances in the decisive third cricket test against Pakistan in Abu Dhabi, which gets underway on Monday night (NZ time).
Six of the last seven tests at the Sheikh Zayed Stadium have been won by the side batting first.
The match will see the two sides return to the scene of the first test, where the left-arm spin of Ajaz Patel scripted a dramatic finale that saw New Zealand scrape to a famous four-run win.
But the Blackcaps were then destroyed in the second test, losing by an innings and 16 runs in Dubai to set up the tiebreaker.
A win in the final test would secure the Blackcaps' first offshore test series victory over Pakistan in nearly 50 years.
"We're really excited to be involved in a decider here," said Williamson. "We know how tough it is to come over to the UAE to play Pakistan, a very strong side that know these conditions well.
"The second game certainly wasn't the performance we wanted to put out, but there are still some positives we will need to build from. If we step back and see it as one-all going into the last it's a really exciting prospect."
Williamson wouldn't reveal if he and coach Gary Stead would make any changes to the starting side for the test, while Pakistan will make one-injury enforced one.
A shoulder injury to bowler Mohammad Abbas means 18-year-old sensation Shaheen Shah Afridi will get an opportunity to showcase his talents.
While he is yet to experience test cricket, Afridi recently starred for the one-day team against New Zealand, claiming back-to-back four-wicket hauls before being named man of the series.
"We wanted to make him part of the test team," said Pakistan captain Sarfraz Ahmed. "He bowled well against England Lions, and that brought him into the reckoning. He has pace and can reverse swing the ball.
"He is improving day by day, and that’s why he is in the Pakistan team. He has talent and is a good boy, learns fast and understands. If he keeps himself in good shape, he can play for Pakistan for the next 10 to 12 years."
Williamson's main priority is figuring out how to stop Yasir Shah, who took 14 wickets in the second test.
"No doubt the first innings batting effort wasn't one we were after," said Williamson. "I guess it was about 45 minutes of madness and someone like Yasir Shah, who's an outstanding performer, bowled very, very well and put us under pressure. It certainly turned the test on its head.
"To follow that up with a very good batting effort on a wearing pitch was a really good sign. There were some good experiences for a number of guys and hopefully something we can build on heading into this last match."
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