You'd do better to cut it back and leave the fruit for a year. You won't get much the first year anyway, and by the time they've established and grown back from ground level you'll get a much better crop in two years' time. After that, cut back a third every year. you're supposed to cut out the oldest (and darkest) wood but that won't be a factor at first. Just cut the weakest until you can see a colour variation appearing.