In my experience, blood magic is a very powerful form of binding an agreement. Blood has always been recognized as a life-force. Signing your name on a contractual agreement in your blood is an eternal commitment. Using blood magic to bind yourself to a person or entity could have some unforeseen repercussions simply because of the fact nobody can fully foresee the finality of such a matter.
Following is a hodge-podge of information about blood and magic. It gives you some thoughts to digest. Feel free to regurgitate anything that does not settle well.
In the steaming jungles of primal humans, lived the free and full rites of sex and blood. The object was to gain power and mastery over life. It was demanded through extreme actions that moved their will forward. These were the first human ancestors of all magicians. Domination was their formula to success. The mage may invoke his primal self by the use of blood.
Blood has the ability to condense astral fluid onto the physical plane. If these astral fluids are absorbed into the bloodstream, they become a health-giving force. If the blood is drawn out of the body, it becomes a vehicle for the will of the individual.
Write with blood to discover that blood is spirit. The person who writes in blood does not want to be read by many. The writing is for the eyes of only one or a chosen few.
Magic is based on sacrifice or exchange. Energy is never created or destroyed, it is transformed. Blood is life so it is a very powerful source of sacrifice or exchange. The energy of life is present in the blood.
I could go on-and-on with these euphemisms about blood but my reply would become too lengthy. The average reader on social media likes things short and sweet.
I have used it but mostly as sacrifices to the gods. Let on some paper, and then burn it. In order to do so you must make sure all equipment is sterile before and afterwards. I used a razor. But some merely use needles for fingers.
Greetings Tristan Krauter
and with Lilith Adder that you must make sure all equipment is sterile before and afterwards,
and would add that you should properly take care of yourself not to introduce any germs into any healing openings you make into the skin.. do not cross-contaminate yourself if there is health risk and so on.
Safety first, always.
I am always cautious about it's use in my pathwork and have not actually done much of it since 1973 when I did the classic "blood sisters" thing of opening a wound in the palm of my right hand to clutch an opened wound in the palm of her right hand so we became "as one" for life no matter where in the world or beyond it we happen to travel, we are always connected by DNA exchange.
It has indeed kept us close across the years and across the miles, and I hope it will in death when time comes too.
Nowadays, I tend to use less damaging methods as my immune system lets me down, and I am too prone to infections to take such a risk.
I am curious to gather if this is the only option you feel open to you as I am sure there are others you could do in it's stead... but I would never say you shouldn't if that's what you feel you must do, your path is your path and the choices you make are not for others to dismiss or approve. So long as the other person involved gives consent and follows same health and safety sense.
I am not aware of any resources to point you at myself as I've not looked into it during my studies. I know there are those who practice using it for various reasons, but never spoken to them so I am of little use there.
I use to cut myself but other than that I don't have much experience with blood magic . Please be safe though Blessings be