RE: right time to take the shot
Pretty much as soon as you can. Turkeys are known for leaving an area really quickly if they don't feel comfortable. I typically like to take a shot anywhere between the 25 and 35 yard range. At this range, the bird isn't too close where you might possibly miss (due to such a tight pattern with turkey chokes), and the bird isn't too far that you might wound or miss the bird. If the bird isn't sticking his head up for you, you can get him to stop and stick his head up by making a quick sound such as "hey!" or a grunt sound. The sound doesn't need to be very loud at all and as soon as he raises his head, let him have it. The nice thing about making sure his head is up is that typically the gobbler will lower his fan down when he sticks his head up in the air. This is a good thing because if you shoot the gobbler and he turns out to be a wall-mounter, your chances of putting holes in the gobblers fan decreases.