NekoShema this true, indeed. I avoid scrying and pendulum because of some reasons.
About scrying, I have achieved it from the first time. From the first time I saw the face of an old man (scary one) into the mirror-in my reflection. The issue with me and scrying is that I lose focus and move my eyes too easily. I also avoid scrying because you only see spirits, but aren't able to hear them. There's no point in me if I can't hear them.
With pendulum, I just don't have success. I move the pendulum subconsiously and has No Idea when I move it subconsiously or actually when spirits communicate with me through my subconsious.
However, I had no idea I have to meditate before this two! Thanks for mentioning, I will deffinetely try meditation before both next time.