I recently purchased a platinum package of Hearts of Iron II (includes Doomsday and Armageddon) at a real bargain price. However, I never played any Europa Universalis-based game before and I'm wondering if HoI2 with all expansions is the proper way to start with Paradox grand strategies. To be honest, I am little afraid of being overwhelmed by the game's complexity and difficulty right from the start.
Should I play any earlier EU game to fully enjoy HoI2 with all expansions? If so, which one would you recommend (first EU, first HoI, or maybe EU2)?
Is it worth to purchase and play the first HoI for some time to get used to game rules, concepts and mechanics? Are these two games significantly different, or is the later version a simple, logical extension of the formula?