Trans-Africa as your first big trip sounds a bit challenging...
But even if you had all the experience in the world, 4 weeks is not enough. Africa is BIG. My experiences of it are only limited to the southernmost countries, but just to see, say, South Africa & Namibia, 4 weeks would barely be enough. And I havent been further north from Zambia, but I think the roads & border crossings will get much, much more exciting (read: tough, and very slow), the closer you get to the equator.
Like others said, 4 weeks would be good for taking a small peek, and getting a first taste of Africa.
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