Please keep in mind that this is delicate because these are people's homes and there are many ill-intentioned folk (not nec. yourself) who enjoy going about gawking at the misery of others as a form of "solidarity tourism". Even those who see this a way of somehow improving the lot of the impoverished rarely take into account the intrusive character of their tourism.
If you truly have your heart set on going in, i agree w/ wreReynolds: go with friends who live there, which implies taking the time to develop friendships and to put yourself on an equal footing, which won't be fast.