Labs07,
In general, remove the hide from the elk as quickly as possible and then keep it cool and dry, then get it to your taxidermist as quickly as possible. Do not salt. If you are unable to get to your taxidermist then fold skin to skin and put in freezer once cooled down.
I would recommend finding a taxidermist before you go hunting. If you have a taxidermist in mind, then call them and ask them how they would like you to take care of it.
second, if you don't have a taxidermist then call around and find out how long it will take, and how much it will cost, prices will vary greatly. Ask around for references on quality and other, soft skin elk hides are not cheap anymore.
third, once you find a few taxidermist that you like, then go to their shop if possible and check out the end product or if they have an internet presents then look at their quality on line. Most will ship out of house to a tannery, but some will do the tanning in house. The end product will vary on softness and finished edging.
Your on the right path by asking before you head to the woods, good hunting!