Cannot help you with the bolts -- sometimes bolts are reverse-threaded, but I would not know in your specific case. It may help to see what the torque spec is for those bolts, and that will tell you how easily they should come off, and you can try both directions as long as you don't over torque them and risk breaking them off (bad!). As for the fluid, yes, if you drained the line, and refilled, you would need to bleed the air out.