The 3D course really helps to sharpen the eye and with the more traditional equipment, roving tends to bring all the practice together, because of the unknown yardages, obstacles etc. But neither will get you ready for the hunt. Too much involved besides the actual shot.
Get permission to go into an area where the deer are hunted. Take one of those disposable cameras without zoom lense and get a closeup of a deer (within 20 paces). If the deer in your area are anything like our little Columbian Blacktails here in California, you will have a real time of it to get a good photo. This is the best way I know of, besides actually hunting them, to learn the art of stealth. Of course, if the deer just stand around and are used to people, it's not much of a challenge.
Learn to hunt the wind. This includes thermals, as they also carry the hunters scent. Beating the animals eyes, ears and nose takes practice. Lots of practice. A deer will not usually bolt if all they do is hear something out of place, but it will put them on alert and if they spot slight movement or catch your scent, you're all done. They have millions of years of being prey to rely on and they practice it every day of their lives. The modern hunter may have the instincts, but most have only practiced the skills on a part time basis for a comparably short time. The animal has a huge advantage when being hunted by the bowhunter, especially from the ground on the animals terms.
Way too much involved in bowhunting to try and cover it in a paragraph or two, so I'd suggest to those that want to learn the art of bowhunting, to read as much as possible, then put it into practice while carrying a camera. There are lots of good sites that have forums where you can ask those that practice it. One that I've found particularly interesting is
The Stickbow
