There is no such thing as a "seed difficulty setting". It's just that some seeds are easier especially for new players, and some are harder, if you're not used to the game already.

I must say that I really lucked out on my very first seed. Larger continents, the start continent was mainly meadows, but black forest and mountains were not too far off. Trader location pretty close to start continent.

Location of third and fifth boss not too far apart, but a long way to go from the center. That was the only "hard" part on this seed. Other than that, I can wholeheartily recommend it to new players.

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