Advice and basic tips on horses, thinking of loaning one :)?

I walk behind my horses all the time. The key is knowing the horse. If you know it's personality you should be fine. I am 100% confident that my horses won't kick me. Horses have great eyesight. They can se all around them including their back end. But it is important to make some noise and let them know it's you walking behind them and not another horse. That way they aren't startled.