Regarding taking your rifles or renting rifles in camp; I'd find out what type of rifle, caliber and scope was available before I made that decision.
These days most reputable PH's have good gun with quality scopes. I'm like all of you and would prefer my own guns but it is MUCH easier to use theirs. It has become more and more of a hassle to take your own. You'll have to get your rifle certified with Homeland Security for starters. They will issue you a 4457 Form that has to stay with the rifle at all times while out of the country. Bribes are the norm not the exception once you get to J'Berg and those bribes are paid to the cops. There is a company that I'd recommend to handle your gun permits once in country if you decide to take your own.
I responded to your PM as well.
