This really is the best platform to learn about firearms, optics , bullet selection etc. Hell that's just fun. But also for the actual trip itself, if you havent done so already, it's very prudent to reach out to 2 sponsors on this site, Travel Express and Rifle permits, I use both and highly recommend them. Henry at rifle permits has an option to have one of his people meet you when you disembark plane, walk you through customs, get your luggage (quickly), take you to SAPS for your rifle permit, and to greeting area very efficiently and securely. It beats the hell out of being stuck in the cattle line of customs for several hours as I've endured once. Lori at Travel Express can also handle your trip insurance which is money well spent. Another small item is footwear, years ago I contacted another sponsor here Africa Sporting Creations and bought a pair of Courtney's, love them, light and cool, I use them in early hunts in south Colorado as well as in my office. You may be covering hot miles.
And bring a reliable digital camera that is easy to use with a good zoom and a couple new SD cards. Many opportunities for photography.
Dont overpack. The ph should provide a packing list. I bring a small kit that includes sunblock, felt for feet blisters, eyedrops as well as a cheap eyewash cup, aleve, benadryl, etc.
Just a few recommendations for a smooth trip to add to your future great Africa experience.