"He's a nice sized coon and I'd really like to save this skin if possible. Any help or advice would be greatly appreciated. Thanks."
Well...... perhaps some of these primitive morons can thin down case skinned skins with a piece of obsidian rock or something, but I found I couldn't, so I just had to bite it and buy a danged Dakota Pro. I bought a power washer too.. A belt drive because I buy tools of good value.. not junk.. they need to outlive ME. I blew seals out of washers that weren't strong and powerful enough! That could have been MORE expensive. Just like getting a lousy fleshing machine.. one can kill them if one puts them to a job that's too difficult.
The pros will tell you to pickle and then to thin and then to repickle.. this is so that the entire skin is both pickled AND degreased FIRST. It won't be tanned good and proper until the basics are established.
One doesn't NEED to pickle at all OR buck a hide if they're planning on tanning primitively, but both thinning and degreasing properly ahead of time might be what is needed before tannage can be accomplished. Well they should be degreased, and thinning too can help to prevent multiple braining and oiling and staking till dry.. ETC! There's a lot to it!!, but therein lies your answer, IMO! Good luck and yep.. I know it hurts to hear it! But only MONEY can solve some of these issues

.. and that is often HARD TO COME BY

. Before the washer and the Dakota, I worked HARDER

! not necessarily, smarter

!

BTW.. wire wheels and bench grinders are really lousy substitutes for electric fleshing wheels. and a hand flesher and beam is really is a lousy substitute for a good power washer and turbo nozzle.. at least IMO.