I just discovered Baguazhang for beginners on YouTube in HD with Jake Mase and the guy rocks.
https://www.youtube.com/watch?v=2ir69i-qAsI
I was about to join a martial arts studio near my home for Tai Chi, but after talking to the owner of the m.a. school, he told me they wanted committed fighters with some background in martial arts. He only had about ten students per class and wanting to interview/pre-screen me before I could join. As of right now, he said I could watch classes but wouldn't be able to participate without beginner's experience. His average student had 3-5 years experience. I give the guy credit though for introducing me to Baguazhang. So I'm going to watch Jake's videos and practice before consider joining a m.a. school.
That's the great thing about the internet, if you have an internet connection, decent bandwidth you can learn most martial arts form by watching and practicing. Watch an experienced martial arts form, pause and resume to master the mirroring mechanics of body movement so you don't injure yourself. Stretch/warm up before you start the Judo regime to prevent injury.
Martial arts are actually lot like lifting weights in the gym, you don't just walk up and mirror the biggest most bad@ss dude in the gym. You got to learn how to walk before you can run. Start with the basics and once you feel comfortable add more complex moves in Judo.
When you're ready and want to start sparing with other fighters, you can join a gym/dojo/martial arts studio, etc.
I'm in the process of doing this myself. I did mixed martial arts ten years ago and worked up to a yellow belt before I quit. I'm starting back up again and am going to use my garage space for space and movement. I need to get rubber mats to protect my joints and feet, maybe a mirror to boot, but we'll see.
Good luck with your Judo journey.