There is a lot of BS and smoke blown up everyone's ass about tipping. The bottom line is to Tip what you can afford.
I'd give the skinners, trackers, and camp people $10-30 USD per week in Rand or Namibian Dollars. I'd give the PH about $200-750 USD if you can afford that. I wouldn't tip a ton more than that to the staff without talking to the outfitter.
I went in 2005. I had plans to tip my guide $500. But then we spent 9 hours fixing fence, and they left me alone in camp for two nights while they went to town. I gave the PH's wife $130 US in Namibia dollars, and nothing else. As she was the cook, and the only person that was nice to me the entire trip. As we had some problems with another hunter in camp from Spain that didn't speak English and was fighting with the PH's everyday. I helped them sort him out as I speak passable Nino Espanol.
Have a contingency for your trophies and how you want them taken care of. I'd know the taxidermist I was going to and try to have a plan for that.
Have a shipping company worked out with that taxidermist and an expediter in the USA.
Have phone numbers for every person in camp, the US Embassy, the US Consulate, and a good reputable place to stay in Windhoek, Cape Town or wherever you are going.
Any questions send them my way. I know lots of people over there.
I'd also recommend you have phone numbers for the Professional Hunters Association in that country.
Maybe your phone will work, and maybe it won't.