No, there's no need to renew the clips. The inside diameter of the seal is larger than the spline, the clip and the bearing surface so as long as you put the shaft back in straight there will be no damage. If you do it yourself you need one hand to hold the hub outwards and the other hand to hold the inner CV joint straight and level as you slide it through the seal and bearing. Easiest way would be have a helper hold the hub out so you can use both hands to guide the CV in carefully as the helper slowly lets the hub swing back in towards the car.