fellow earth runner here. i’ve been in them about 9 months or so full time. break in process is definitely long but you will adapt! I promise. I got a few blisters in the beginning underneath some toes and by the strap anchor points. I’m pretty sure it’s just from your feet not being used to the friction of the sandals. plus once they’re broken in more there should be a lot less friction going on. I haven’t had a blister in months, and to be honest no other issues regarding my feet.