The good news is that your exposure to Hapkido and Bujinkan has at taught you how to fall to a degree.
The bad news is pretty much what Thai Bri said. Judo takes its toll on the body, especially in the beginning when you're not comfortable taking falls - you tense up and get injured.
My advice (I started last summer when I was 30) is to spend extra time warming up, and listen to your body througout the workout. Most instructors are reasonable people and won't take offence if you want to take a breather. Nobody expects anything from the white belts except a good effort.
Go for it!
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"It was about that time I realized that searching was my symbol, the emblem of those who go out at night with nothing in mind, the motives of a destroyer of compasses." -Cortázar
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