This video is a great example for new hunters to watch. I feel like with all the podcasts, forums, and hunting shows, people assume there is a "magic formula" or "recipe for success" when it comes to guns and gear. The only real recipe is putting the right bullet in the right place. Just because you have a large caliber bullet doesn't mean you'll knock an animal over every time. A smaller caliber that you can actually bear to shoot enough times to get proficient with is going to serve you much better than a huge mule-kicker that you hate practicing with. I agree with everyone else saying go for a smaller caliber you can shoot better.
Here in the states, I feel like many people substitute their training and practice with more expensive or fancy gear. A cheaper rifle and more ammunition would serve most hunters better than the super expensive fancy gear that they rely on in place of practice. Fancy gear is great, too, but you HAVE GOT to practice with it. It's like the guys who spend thousands on a set of ping golf clubs and are shocked to find they don't play as well as Tiger Woods. Practice doesn't make perfect, perfect practice makes perfect. Don't just shoot until you can hit the target, shoot until you can hit it reliably.
You can take what I know about hunting Cape Buffalo and put it in a thimble and still have room. But I do know the value of regularly practicing with your equipment and that having the confidence that comes from experience is invaluable when you put your finger on a trigger. Knowing you can make that first shot count makes all the difference.