I am putting on a new timing chain. I have loosened the eccentric but would like to know the ideal position for a new chain.

Also, I would like to remove the eccentric to clean and grease but cannot budge the bolt holding the crank arm on. I will say that gorillas surely put this bike together because it took 2 guys at my lbs with 3 foot torque arm tools to remove the cassette lock ring so that I could put on a new cassette. Soo, other than bringing the bike to the shop is it usual for it to be so difficult to remove this bolt? It's an FSA gossamer crank and ebb.

thanks.