Given you are walking only 5 days, your most likely injury will be blisters.
#1 for Blisters? Avoid them. I won't tempt fate....... But I haven't had any yet....
There are many approaches of course. This is mine.
Correctly fitting footwear, larger than normal. My boots are 2 sizes larger than my shoes.
Double layer socks. Thin inner pair, thick outer pair.
Vaseline the feet at the start of the day and half way.
Boots off at every stop.
Boots and socks off, a couple of times during the day.
Only shower at night. Keep feet dry in the morning.
Be very aware in the first 30 minute and after stops, how your feet 'feel'
Is the heel slipping. Is it held down OK by lacing technique
Is the ball of the foot sliding on the boot surface.
Fix any of this by adjusting lacing.
As soon as anything feels wrong, stop! Treat it.
Any hot spots, use Sheep's wool.
Again, a more detailed explanation here:
http://robscamino.com/foot-care/
My wife also followed this regime last year. No blisters....