That is not a blog. That is a whole site that takes years to read fully and be comprehended, which you didn't.
2. If you so decided to apply your judgement, once you get to it .. listen to how this sounds.. Black Magic. Does that sound to you soft or with doubts?
Be MEAN and VICIOUS, once you do it, YOU DO IT! YOU DESTROY!
To get to that part, you first have to understand the decision and your ethical judgement on this, but apart from this and the act in itself, it must be meaningful - ie. you really MEAN IT.
So excusing my language, fuck all of the bullshit of the victim being so powerful. Make it/them not powerful, make them weak before you destroy. Make yourself stronger and bigger and more capable and more controlled and with self power in magic.
Do not debate the doubt of the inexperience, beat it with experience and don't be soft when you go to "war" and "executing" spiritual actions.
2. You can prepare the "victim" (the offender or low life, so we set at least a bar here of understanding and power dynamics) by piercing their defenses, like the immunity of the body to fight diseases, you do so spiritually. Runic magic, visualization and so on.
Anything that is attacked repeatedly, in general, it gets weaker. So a few repeated negative and disharmonious spells before the main spell can do the work as is.
Usually when you target someone you don't deal with them, but the planets and the matrix of the Universe. As you understand to manipulate the Matrix of the Planets, you understand to manipulate the reality. So read and grow and get to know.