How that manifests in practice depends on the muerto in question. A gypsy spirit has a certain style of working, while a madama spirit has a somewhat different approach and temperament - just as a chinese or arabic spirit might have their own unique specialities. Each will step in as needed, guiding, nudging and correcting things as you work, based on their specialities. Often these works are surprisingly simple, or even strangely cryptic - using everyday objects, gestures and ingredients that you might never have considered using in a spell before. Sometimes an irrepressible tune or song bursts out of your throat causing the air to vibrate with spiritual electricity. Yet, no matter how simple the gesture or mundane the object employed it's like a rocket has been lit under the work because it comes straight from the source.
Here is a deceptively simple little work I was given in this manner. It snuffs out pernicious negativity or spells flung at you. Although it's quick and requires a bare minimum of ingredients I've found it to be exceedingly effective.
Candle (a short stub of candle is all that is needed)
Clear glass bowl, preferably with a flat bottom.
Open the Bible at the book of Psalms (randomly choosing a page in Psalms). Place the empty glass bowl atop the bible as pictured. Take the candle that you will be using for this work and proceed to spiritually 'clean' yourself with it by passing it all over your body from head to toe, praying as you do that any witchcraft, molochia or any other negativity be removed and transferred into the candle. Let that candle take it all up like a sponge.
Next, drip some hot wax (from another lit candle or tea-light) on the bottom of the bowl and while the wax is still soft, position the spiritually 'dirty' candle so that it will stand securely in the bowl, ready to be lit. Pour holy water into the bowl so that it's roughly an inch deep in water and the base of the candle is suitably submerged beneath the holy water.
Call on God, your ancestral spirits and spiritual guides to snuff out the tricks of your enemies like a flame snuffed out by water. Call them into the holy water. Light the candle and leave it to burn. The flame will eventually meet its demise in the water - dousing any nasty tricks and negativity along with it.
Finally, peer through the clear glass bottom of the bowl to find a passage that jumps out at you. By means of bibliomancy you will now be able to divine more about this matter.
Dispose of remains appropriately and then finish off with a spiritual bath to seal in the effect.