Spells and Black Magic
Personally, I do not like working with spells or black magic. Unfortunately, it does come up now and then. Mostly it comes from a past lifetime.
Working the Spell Backward
Find out who put the spell on them, when, and why.
See if an apology is needed from your client to the person who put the spell on them. Sometimes that works.
Other times you have to talk to and convince the person to retract the spell.
If not, then just try to return the spell to them or send it into the light.
When You Cannot Remove It
If you cannot get rid of the spell, then you need to call in Archangel Michael, Jesus, or God to help you remove the spell from your client.
Practice
Put the four moves where you can see them. 1. Write the four moves on one card: find out who, when, and why; ask for an apology; ask them to retract it; return it or send it to the light. 2. Add your one-line fallback for when none of it works: call in help. 3. Say the sequence aloud until it needs no notes. 4. Pin the card above your desk.