Since weight is an issue when I backpack in, I leave the materials at my truck (trail head). When I pack the head and meat out, I spend the time to inject the antlers while at trail head.
All of the materials needed can be ordered at most taxidermy supply stores. VanDykes sells all the materials and they have an on-line store where you can order from your home. You can also but the heavy gauge syringes/needles at most feed supply stores.