i can only name a couple of things that you will need off the top of my head

Scaple ( MUST USE ) you cant just use your favorite pocket knife the whole time. Speacialy for capin
gloves
tan ( if doing yourself thats a WHOLE nother story)
freezer
bondo
epoxy
borax(for the antler and then use a dremal to clean the skull cap) you can do it what ever way you choose just make sure its clean so no bugs get to it
FORM
shaver( for the form if alterations are needed)
Ruffer
Carpet knife
Ice pick
Needle
Thread
Stand for the form to mount to
Sand paper to give more detail in places that are needed
tools for tuckin the eyes lips and nose
Sharpe ( never know when you will need that)
And lots of time to get everything right


there is a lot more that goes with mountin but this is just what i can think of right now