I would agree to use the above if you are nearby and can afford it.
We tried one year to cure two sheepskins ourselves, we bought the items needed but
ran into difficulties buying saltpetre initially, cause you can make bombs with it apparently ::)and
we live in Ireland so they will not sell it to anyone who asks - ( we are not even allowed
fireworks - how sad is that
It was not easy, scraping the back off was hard work, and the cure didn't take too well,
after a lot of work and expense we ended up tearing one, :-[and were not happy with the
other.
If you can get a professional to do it - do it