I have used many techniques over the years. Not all will work, please adapt any method to make it fit your situation.
Styptic pencil or powder, silver nitrate sticks (will sting somewhat), ice pack, hand pressure and a bandage, cautery (high heat, effective but hurts).
My favorite for home situation is to take a sock or panty hose, cut the toe out, and place over head such that the ear is under the wrap. You can then place an absorbent bandage under the head wrap and this will apply pressure to the wound until it either stops or you seek further help at the vet's.
Dr. Van Lienden
Dr. Raymond Van Lienden DVM
The Animal Clinic of Clifton
12702 Chapel Road, Clifton
Virginia, U.S.A. 20124