Well, let me tell you how mine found me, an introduction, if you will. One day I was doing reading on guides, animals in particular. The thoughts were with me all through the evening, and after going to bed. It was on my mind the whole time I was falling asleep. Then it happened. I was dreaming of brown bear and me in a river playing. He was pulling me along as I held on to his fur. I will never forget that feeling of course wet fur between my fingers as I held on. He was a powerful beast, and I felt very protected and happy.I woke up and smiled all that day, as I had met my spirit guide. It was all quite exiting.
So my spirit guide came in dream. If you do the same thing, it might happen to you, too. Have the thought of meeting your animal guide, or spirit guide guides are not always animals) as you fall asleep. I mean have it as the very last thought. Now this may not work for you. But I pass it on because it worked for me. I've heard others say to meditate. I think deep trance is more of where you might find it. But dreams seems easy. Don't be discouraged if it doesn't work the first night. Just keep thinking, and have it be last as you fall asleep. Good luck!
May you find what you seek...Blessed Be...