OK if you're really serious the first thing is to buy a book called buffalo, elephant and bongo vy von mearers available at safari press for $40 us. this is written by an M.D. who does just what you are talking about. Some of the problems you are going to run into besides language are governmental, logistics, theft, read the book. In zim at least you have a chance because the country is pretty civilized, in cameroon I believe you have a 50/50 chance of coming out alive. in anycase you must realize that you are going to be up against a pretty stiff wall.