Do you have to disconnect battery to change car stereo?

I have a honda accord 94, which is pretty old, and i bought a new stereo(because old one broke down).



And as i read through the instruction for the installation,

it told me to disconnect the negative terminal of the battery,



i tried to do it, but the screws are so rusted that i couldn't get it off,

i tried hot water and cola.



To further describe how rusted it is, i could say the screw's end, which is supposed to be octagon(?), lost its shape, part to my struggle to get that thing off.



So...... the introduction was kinda long, i want to know if i could

just go ahead and change the stereo(i will be working with wiring and stuff) without taking the negative terminal outDo you have to disconnect battery to change car stereo?
no, you dont have to, it just prevents from blowing a fuse really





but i just install them without doing anythingDo you have to disconnect battery to change car stereo?
its better if you disconnect it, but you dont have to