If at all possible if you have never dubbed a OE I strongly suggest you find some one who has if you intend to show the bird.
Older Birds will bleed more, They will bleed more in the heat as well.
You will want a very sharp serated kitchen shear, or surgical scissor.
prepare a small cup of Ice water, dip the comb in teh ice water till it begins to Blue. This will indicate lack of blood flow and cool teh body temp as well.
Hold firmly by comb to restrict blood flow, see below.
Start the Dub with the earlobe, lightly pull the earlobe outward being carefull not to stretch the skin, cut the earlobe off with one smooth cut. repeat on other side.
Wattles, Start at the beak side, trim very close to the beak to remove the begining of the wattle, Pull lightly but not so much as to stretch the skin. Remove all of the wattle by cutting the skin just above where it is actually attached. Repeat on other side.
Dip in cold water, to rinse away blood and further restrict blood flow. You may need to do this a few times.
Holding comb firmly, begin by cutting straight up the back where the comb joins the head, the rear of teh comb will fall off. the second cut will remove the top, this is not a scalp job imagine a relatively straight line from 1/4 inch above the scull terminating at the beak where the comb attaches. This is your cut, a slight curve is actually desired but not exagerated. Once the second cut is made you will round off the back of the comb by lightly trimming the sides of the cuts and to round the two together.
Dip in cold water a few times and watch for about 5-10 minutes do not place in direct sun.
You can use flour as a blood stop, some use cinnamon both work well.