my first DIY was my sterio in my first truck
it was really fun actualy. kinda hard to learn the wiring at first so i got the deck installed where i bought it and i bought 4 jensen speakers to go with it and it was super easy to install and after that i got tho 8 inch subs to put behind my seat, for a two seater truck it slapped lol. not much room to improve really. i had a few problems maybe 4 months after i put the subs in but easy fix. i forgot to cap the wires. fixed that works good now. jus do your research before you DIY.