First of all, what part of Nigeria are you going to? In general you will be okay. No, life in Nigeria as a whole cannot be compared to that of say U.K or Canada etc, but at the same time they aren't sending you to Baghdad or Kabul.But for 4 weeks, with 3 other co-workers you'll survive. With regards to malaria, just visit your primary care physician and s/he can give you a prescription for anti-malaria drugs. There are some on the market you take as little as once a week.