A 4ch Line Out Converter needs the 2 pair of wires from your front speakers and 2 pairs from either your shaker subs or the rear wires. I personally would use the front speaker and the shaker subs for the Line Out Converter. They are all up front and keepa it tidy.
Once that is decided you'll have 2 sets of RCA plugs to work with your amplifier. I would amplify your front speakers and the subwoofer. Leave the rear speakers on stock headunit power.
From there you just need to decide where you want to place everything. Run power wires on the opposite side of the car from speaker wires etc. If you dont u can have "noise" coming thru your speakers.
Just do a bit of reading first. But I always find it helpful to just grab a piece of paper and draw out the whole install. You'll be way more prepared. Its just hooking up wires and placement. Once its all drawn out its just execution. It can be easy if you want it to be.
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2011 Kona Blue MT82 V6 Mustang Pony Package 3:31 Gear Ratio, Interior Upgrade Pkg, Security & Shaker500/Sync
Mods (in order of installed): AM Bama SCT SF3 Tuner w/ 87 Hybrid Tune, Airaid CAI, Hurst Billet Plus 2 Short Throw Shifter, Lethal O/R H Pipe w/ Stock Exhaust, Blacked-Out Tints on Rear Windows, Full Ceramic Tint on Front Windows, Metra Touchscreen Dash Adaptor, Single DIN Head Unit, 6.5'' Component Speakers Fronts, Stock Rear Speakers, 10'' Sealed Subwoofer, 4ch. and 1ch Amplifier. LED licence plate lights, LED interior dome lights, FRPP/Dynamic shocks and struts, SR Performance lowering springs, GT500 Strut Mounts, BMR Adjustable Panhard Bar, BMR LCA's, BMR Relocation Brackets. Rear Seat Delete.