If you don't have them, it's probably not a bad idea to get some Stage 8 locking bolts, as the majority of the header bolts are almost impossible to get to without taking everything back apart once it's all back together.
Also allow yourself some time. Yours may not be the same, but I had a hell of a time with the dipstick tube. I probably spent the better part of 2 hours just trying to remove it, and finally resorted to vise grips on top to pull it out and just ordered a new one at the Ford dealership.
'05 Mustang GT Premium
CMS Stage 1 cams, C&L Racer, Lito tune, Jeg's oil sep, CMDP, SR UDP's, JBA stainless LT's & catted H, Magnaflow resonators, MBRP axle back, BMR springs, Koni STR.T, BMR LCA's & backets, J&M upper & mount, J&M Al panhard, DIY panhard brace, Steeda Tri-Ax, smoked corners, Raxiom Vector tails, Brembos, S550 GT Premium wheels, 2010+ door panels