Welcome to the site. I think you'll find that doing the small mods will give you more confidence to do the bigger ones. Example, swapping out lights with LED's is most likely the easiest thing. Also adding lights (cargo,glove box,footwell) can give you more convience.
Have fun with your xB.
HTM 5spd, vent shades, mud guards, LED b/u lites, steelies w/ chrome lug nuts & chromed dust caps, beauty rings, TRD black grille, Oznium vert.vent lites, HID's, black vinyl head light eye lids, sun shade,side glass tint, variable delay wiper switch,all weather front mats, rear spoiler, front running lights LEDs w/ dual color, electronic flasher, LED turn-stop-tail rear lights, LED glove box light,footwell lights,cup holder lights, amber fog lights,Bazooka sub,front black matt bumper cover.