The highlights/bulbs are pretty simple to get to, to change them out. If you follow the directions on the headlights, they are pretty simple to install. Your halo lights would be tied into the parking lamp circuit.
LED underglow is also pretty simple. They don't draw much power so you can leave them on for a good while when not driving, say like at a car show or a burger joint and it won't drain the battery.
Usually with stuff like that I like to keep it on a switched power meaning the key has to be in the on or maybe tied into the parking lights so I don't forget about them and leave them on all the time..
:: 2017 Jeep Compass High Altitude ::