Not hard at all. First use the crossbow for 95% integrity. Also find all of the animal signs, cover points, and aim for the heart. The closer you are the more points you get (up to 150). You also get multiplier points for shooting from cover points, but sometimes if they are too far from the animal you can get more points for shooting from closer. Try to find the trophy animal. There will usually be one bigger than the others. Some of the hunts also have challenges you can see those by pressing the back button. Once you have done all of this aim at the animals heart and if a gold medal is showing in the top right corner let the arrow fly. Most of the early hunts you don't have to find all of the cover points or animal signs but the last couple missions they get quite a bit harder and you will have to find everything.