It is dependent on the type of restoration tools.
In the old days with PSD 7 it was quiet a laborious task..
But now you can smudge blur and all sorts with a magic tool, so its not easy to break down the
way an individual goes about the actual repair.
I cannot set up a Utube thingy, ... maybe if I tried!!! but there are lots of them.
EASY 1st steps, I followed myself at one time.
So I imagine thats the way to go.
It would take an awful amount of Roots space to explain thoroughly ::

xin
otherwise maybe by pm but I am by far not the best to teach, we had / have some real masters on here.
Just go through the old pages of restorations and you will see some 'smashers' and miraculous work.
xin