Hi Sann!
Dowsing is such a helpful tool for me and I love using the pendulum, and though I’m not an expert, here’s my take on things.
I think a huge part of it is practice. I know it took me a long time to really get used to things and build my own little system for the pendulum to work on. Have you tried communicating with your pendulum? It sounds silly, but it helped me a lot to sit and really think about what I wanted it to do. (Vertical for yes, horizontal for no, sideways to the left for maybe, sideways to the right for “I can’t tell you.”) It doesn’t matter what you use for your pendulum, but it really helped me once I figured out my system. For example, you could hold it and meditate on each command, such as clearly stating everything in your head, like “move horizontal and only horizontal for yes,” etc. After a while it should follow those commands accurately.
As far as it giving wrong answers, it’s true that there could be lots of reasons to why it does that. For me I find that if I don’t feel completely clear or open, the pendulum definitely tells me just what I want to hear. This is especially true if I’m very attached to the subject I’m asking about. Really focus on clearing you head beforehand! And it’s true that it can be a wrong time for the answer, which is why I have my pendulum indicate that to me by moving sideways to the right. You can also print out and try a pendulum board! Those are very in depth and helpful in accessing your intuition, though I find using one to be kind of draining as it requires a lot of focus for me.
I would probably start with shorter sessions in the beginning, because I remember getting tired very quickly before I got comfortable with it.
I hope I could help! These are all just from my personal experience, so feel free to fill any gaps in with your own intuition. Good luck! 🙂