penetrating oil and a breaker bar. used it to get out some seized bolts from my friends civic. breaker bars cant be stopped. or if you have an air compressor there is a BIG impact gun..i forget what model it is...adjustable torque. my dad uses it to change wheel/tire assemblies on construction equipment.

penetrating oil helps alot. WD40 is a water dispersant by nature, not designed to loosen up seized bolts.

 

Where can u buy this stuff at

 

Craftsman makes a mini-breaker bar. It's only 12 inches long. That's what I use for tight spots. I also have a full sized breaker bar. A heavy half-inch driver with a 6-sided socket and a rubber dead hammer also works well...

 

no need to break loose the bolts u have circled to change the pads, the ones that u do need to break loose, break loose relatively easily

see the diy

https://my350z.com/forum/brakes-and-suspension-diy/58195-how-to-change-brake-pads.html


edit*
just noticed that ur changing the rotors also, nvm about what i said above then

 

Mine were on pretty tight too. After battling with it for a bit, I got a small pipe and used it as leverage. Worked well for me. I was a bit nervous since I didnt want to break the damn bolt off, but everything went fine. Good luck if you havent finished yet.