29.97 to 25fps

Hi guys,
i have to apply slow mo effect using Twixtor and I also have change the frame rate of my footage. It's shot in 29.97fps, so should I change the frame rate first and then apply the slow-mo effect using Twixtor or would it be wiser to apply slow-mo using Twixtor and then change the frame rate to 25fps?

Hey - was that a trick question? Made me think....

Without Twixtor experience past the demo I fooled around with a bit I'd say there must be an output frame rate setting upon export. There must be. So keep the frame rate 29.97, use Twixtor. Export as 25fps file.

Thanks for the reply Mizamook, I really appreciate it.