If you gaze long enough into an abyss, the abyss also gazes into you. -Friedrich Nietzsche
This means you must be careful not to become the same evil that you fight when examining solutions to your dilemmas. I like this quote because it reminds me of a ritual tool called a black mirror. Ceremonial magicians such a Poke Runyon of the temple of Astarte experimented with using dark mirrors to summon spirits. The spirit would literally come into view of the mirror like on a phone screen. We all have black mirrors in the palms of our hands. However I suggest making your own black mirror specifically for the purpose of scrying. My Sorceress friend Jade taught me a quick, cheap and easy way to make your own black mirror for scrying. All you need is a picture frame and some black paint. Just paint the back side of the glass black and you have a dark mirror for less than $5 if you go to a dollar store or thrift shop. She also suggests to use candles close to the mirror in a dark room. Gaze into the mirror until your reflection vanishes and observe what you see. Is it looking into your subconscious mind or peering into the other side of the veil? Thats up to you to decide.
Poke Runyon goes further into detail with his mirror scrying. He places candles and incense in a very specific formation so the smoke acts as another filter for the scrying ritual. The black mirror is placed in the center of the circle of the triangle. Runyon did an amazing job of reconstructing the magic of Solomon. His video can be viewed here for the full explanation.
You can use other objects for scrying such as crystal balls. Or you can leave them on your altars as gifts for the spirits that walk with you for them to use. They can give you messages through other means such as intuitive guidance. That way you can go about your day while they do the work.
You can scry into anything really. Pictures, sigils, videos, animals, places etc. The more you do this the more it happens naturally. Objects and places can act as antenna or portals for receiving downloads or communication on a spiritual level.