What if Carrier Guide is not seating? Do you force it?

NO, do not force or bend. It will break and be detrimental to success. Three main reasons it will not seat: 1) something is in the CHROME Loc box. Carefully inspect and clean 2) bone was not reduced sufficiently and is ‘holding it up’ 3) soft tissue is in the way. Make a stitch, or reflect more if needed.