Range,

It think you answered most of your own question. Just chucking arrows is not a good idea, fun maybe though. If you do not have someone to analyze your form, whether it be golf or archery, and you have grooved habits right or wrong, just how do you know what to practice or change? If your knowledgeable enough doing a video of yourself shooting is handy. I agree with Blackfrog that the best practice would be under controlled conditions. Shooting poorly executed shots just reinforces bad muscle memory.

Aim Hard!