Don't worry,just do it.I have done it.My car was 2007 Civic EX.I used to worry about whether there is something inside the engine.It proved to be very simple.14mm deep socket,a little presure,a little torque,counter-clock unscrew.Before that I gave some WD-40,but I feel you may not need it.And!The honda 4s tried to cheat me!They even sold me the gasket which hinted that I should open the engine.Bad guyes!