If you are staying night in Johannesburg. I’d stay at Africa Sky and use their rifle permit service. Their guy at airport Gilbert is great. You don’t need a service at Windhoek. It takes 5 minutes. Just send an email with information 2 weeks before your trip (you probably won’t receive a response) then show up at gun counter with your PH and the same papers (invite letter, 4457 (or gun license), 1 page Namibia gun application, copy of passport, maybe itinerary if they ask) they’ll write you a permit in 5 minutes. I just returned home from hunting Namibia two days ago.