If you have the 5.7, welcome to the world of 16 spark plugs, coil packs replace the spark plug wires, coil packs are easy to spot, $ are on top of each valve cover, 2 plus per cylinder.
The left rear plugs ( by the brake boaster ) are a pan to change, I find that if I get right up to the engie bay, its not as dificult, but watch that you do not lose the bolts for the coil packs.
Taking off the air box right up to the Throtle body frees up sapce on the right side of the engine.
OEM champions seem to be the best plug's to use, any non copper plug has a hotter spark and the hemi dosnet run right with Plat. or IRD. plugs
Anti seaze, ( hemi heads are ALUIM, ) gaping the plugs, and do not over tighten the plugs, are the basics... hand tighten, than slowly sung up the plugs.