Whenever I do a working with more than one ritual I will make note of the ultimate end result that I want to manifest before I do the first ritual. I write this down in my journal. I keep this intent in mind when summoning each spirit and preparing each ritual so that every spirit is clear on what I am summoning them for.
Similarly, I will note things that I do not want. I like to keep my requests open without being so general that they don’t really do anything. So for example, if I want an enemy to be confused, I will ask for confusion and let the spirit figure out how to do that while telling the spirit things I’d rather not happen. This way the results will manifest without causing undesirable side effects. Sometimes you can’t avoid some side effects, especially when you are dealing with chaos, but this helps.
Also, be wary of excessive amounts of rituals. If someone’s already dead stabbing them again isn’t going to anything except perhaps amuse you. Do what is required, no more, and no less. There are demons in DoM that can assist with divination and wisdom so that you know what to do.