I will keep it simple: I had little experience with magick, decided to try goetia, got into it, made very big mistakes, and two people died.
The guys I messed with have been messing with me for 2 years straight now. I want to learn the right way to get rid of them without more trouble. (I have been away from magick since that.) (And as some of you may be thinking, i am very good at getting in trouble indeed.)
Let me tell you a story.
Some years ago, I met a man. He told me that he got involved with a satanic group that involved animal sacrifice. He got stuff, but was then being tormented by what he called evil spirits. He converted to born again Christian and they're still bothering him. He claims this is the fate all occultists deal with.
He really annoyed me. My theory is that these weren't actually evil spirits. They were possibly normal earthly spirits who were deeply offended by him and his satanic group. Frankly, if I found out someone was hurting dogs, cats, or some other small animal, outside of food or self defense, I'd want to beat his ass too. Hell, I beat myself up over accidentally maiming a toad while weed trimming.
He thought he could convert to a new religion, and let that be that. Obviously that didn't work, because of course it wouldn't work! Why would it? You hurt animals and thought God was gonna rescue you? What really made me mad is that he lumped all of us with him. I stormed off to keep myself from saying/doing something I'd regret.
Anyway, the point is that these are living thinking and feeling beings your working with. You gotta treat them that way. This includes both formally introducing yourself, getting to know them, and having a means to keep them under control.
When I first got into demon stuff, I started with three books on demonolatry by S. Connolly, and one or two by Asaneth Mason, a Luciferian writer. These authors taught me to approach these spirits with respect and reverence, like you would with a god like Odin. You don't give like a servant, but you address their power without diminishing yours. As well as ways to create a sacred space that resonates with their energies, which pacifying them.
The traditional Goetic way is basically like wrangling in wild beasts, then demanding they perform by showing off a badge and cracking a whip. They don't like that. That's why so many steps are involved. They're literally safety nets.
In my opinion, if you're gonna work with the Goetic spirits, I suggest you do as I did. But before that, I'd suggest you familiarize yourself with some god or gods first. Develop a relationship so they can help you.