I think the absolute first was the LED projector reverse lights. Then the LED interior lights/polyfill. I waited until I had all my black trim and grille inserts before I finally swapped the Trucklites from my TJ and put on my rock rails. Then I swapped in the 430N head unit. Then it was wheels/tires, followed by the leveling kit/intake/exhaust. That's where I'm at now. I'm still waiting to build up the courage to try putting on my hood blackout decal. That's a lot of vinyl for someone without any vinyl experience.
Only had mine for two weeks but so farive filled the rear speakers with polyfill and upgraded the wheels to some MB TKO's and bigger tires. I also bed lined the front the freedom panels to get rid of the "white out" look. Will be doing the same thing to the inside of the top sometime.
2013 Jeep Wrangler JKU
--Mod Plans In Progress--