Great news! I am sure youre going to have a great time!
A small recommendation: pay the extra $60 and have your passport expedited..
Your hunt is still 4+ months away.. but you dont want to delay getting everything in order.. Time is going to start passing by pretty quickly while you get everything else in order.. youre going to need your passport in hand before you can apply for your permit to take your rifle to South Africa.. If you dont expedite it takes 4-6 weeks to get your passport back after you apply for one.. thats after you take a day to get passport photos knocked out, fill out the paperwork, and stand in line at your local post office, etc.. to get your application submitted..
You need another month + for getting your paperwork submitted to riflepermits.com so that they can get your permit in order in advance..
IMO its a lot better to get all the "administrative" aspects of the safari knocked out well in advance.. you dont want that sort of thing looming over your head and taking your focus off of more important things like daydreaming about stalking one of Gerrits big kudu, or spending additional time at the range practicing and figuring out what the perfect gun/bullet combination is going to be for this first African hunt