Changing rear discs,
 

Just after a little advise, the rear discs on my widetrack jdm sti need changing, as the car is 12+ years old and they have never been removed before would I be best to invest in a helicoil kit just in case the rear calipers strip. Just unsure of the odds in them coming out ok, if so am I correct in thinking m10x1.5 for thread size.
Also any other advise before I tackle them, i.e. Is it worth buying new shoes whilst all apart. I Presume no special tools are required.
Thanks