I found a new driver in my garage! But it has a stiff shaft so I was wondering how I should swing it?

So I found a Taylormade burner superfast 2.0 in my garage this weekend over thanksgiving, but unfortunately for me it's a stiff flex shaft. My normal driver is Taylormade burner with a regular flex shaft. I just want give it a try for a round, so I was wondering how I should swing with this stiffer flex compared to the normal flex?