He rates McCullum "a gutsy character", who will want to compete and get the most out of this series.
"If they do well it'll be a big tick in his box."
There is a strong view that underdogs New Zealand will struggle to push the test into the fifth day. Smith isn't interested in that sort of talk.
"The drama (over the captaincy) hasn't helped that perception. We're certainly not looking at it like that," he said.
"Certainly in our minds we did our work yesterday on the video and there's a lot of respect and understanding for how we want to go about it.
''We played New Zealand in New Zealand (last season) and it's not as easy as everyone says.
''If we can win it, and win well, that's what we want to do."
Newlands is South Africa's 'banker' in terms of winning test matches. Since readmission to the international game in 1992, they have played 24 tests in Cape Town, winning 16, drawing five and losing just three.
''It is the marquee test of the year. There's a great atmosphere and we love playing here," was Smith's reasoning for the success rate.
''When you've got a good record on a ground you immediately arrive with a certain confidence. We know what to expect when we get to Newlands."