last step
you will lose some amount of "sharpness" when resizing, so this is a general guideline, use your eye to judge.
resize to TWICE the final size, for example, if you going to resize to 700 pixels longest edge, resize to 1400 pixels FIRST, go to filter --> sharpen --> sharpen
do it ONCE if you have usm before, TWICE if you have not. then resize to 700 pixels. some photos are more resilient to this than others, but no more than TWICE, please.
hope this helps. anyways, what do you mean by best IQ? IQ refers to full size image leh, you can't tell much IQ from resized file. 700 pixels, see what IQ? even a blur picture can look sharp..