Your idea works well. As long as you have the complete will power through the entire ritual it will most likely work. I'll warn you now, though, any doubt or feat that you have of it, you need to get rid of, or else this will go the wrong direction.
Also you'll want to be wary of any of this person's spiritual guardians. Even if he/she is unaware, they might still be there. If you do this and they find out, you can expect retaliation. If you fight them, you may have more on your hands if they bring in their alliances as well.
This idea can go ugly quick in your side of the arrangement, so make sure you have a great deal of warding on you that can protect from any counter-curse or anything like that.
And remember don't doubt yourself or you will fail this.
"'THE WAY I SEE IT,' said Crowley, 'no one has to pull the trigger.' He gave Aziraphale a bright and brittle grin." -Good Omens by Neil Gaiman and Terry Pratchett
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