DIY ? sand off the old lacquer ... let it more or less b the same feel all over ... wipe off all dust and dirt.
hold lacquer spray 45° towards your surface, steady and left - rite movement, spray 'away' from u - meaning if u start off at the bottom of your guitar (body strap nut) spray towards the neck (presume u already taken off the neck) becos the spray droplets will b ahead of your finishing parts.
but for me, after the finishes ... it'll feels kinda sticky with the laquer on it so i rather not have a 'glowing' finish ... but that's just me.