If it makes you nervous borrow knee and elbow pads :-)
You can even toss sponges out there on the ground and practice maneuvers around them.
If you look up ... oh, I don't remember what it's called, but it's the "level I" bike course that the League of American Bicyclists does. I took it and there were some good, basic practice strategies for handling skills. Being able to just focus on that really helped me - I do *not* pick up skills without focused thinking-about-it practice.
I was practicing 180's in a parking lot before a ride, and *trying* to make sure to watch for any traffic that might come along, which there hadn't been... then suddenly there was this truck... I stopped and the driver looked at me and said ever so kindly, "It's okay, I was watching you." I figure he thought I was trying to conquer a personal demon, or honestly didn't know how to ride a bike at all, or was recovering from something or... but it was so kindly said and I thought, "hey, if we all treated each other as if we were fragile, it would be a much nicer world, eh?"