Yes, u need to season the shoe or else u might get hurt in doing
longer distance.
Shoes, clothes, sock, underwear, caps and other gadgets(u be using
for THE RUN), have to be test and getting use to before the RACE.
Getting prepared before will put your mind at ease and concentrate
on your run.
Toenails painful.....aiyoh...bad timing...My experienced with
toenails, just let it rest, but on a plaster(i use Watson cushion
plaster) when i run. At the same time try to get another pair of
shoe.
If you are injury(toe nail) or others, definitely will affect your
running. If there is a need to run, just get a plaster, cushion it,
lossen your shoe lace(to give more spaces) and run.