That’s the thing with magick, you have to do what feels comfortable. Many people have their own ways to call on spirits, and not all of them are the same. Once I feel comfortable with a spirit, be them angel, demon etc, I don’t use any sigils or seals or anything, I do what feels comfortable for me and it works for me.
I’ve only called on her once and this was a while back so I don’t remember the specifics of what I called her for. I just remember hearing her voice and her coming through for me. I’m the opposite, I can hear, I just have a hard time physically manifesting spirits, if other than signs through smoke or flame, but I’m ok with that.
I’m sure someone will chime in with their thoughts, I’m sorry I don’t have too much experience with Lilith.
Have you tried divination, such as a reading? Members are always offering them for free in the reading thread if you can’t do one yourself. You have to check frequently because the spots fill up fast.