It seems like one of the bottom speakers of my 1960 is no in it's place, it's just hanging there and sliding around each time I move the cab. Should I take it to a tech, or open it up and see myself? Also, I'm gonna run a 5150 through it, should I just put it on mono, and hook it up to whichever (4/16) input?

Open it up, chances are, the bolts holding it in place have come loose. If its something worse, close it back up and take it to a tech

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So how do I open it up, just take every single screw off the back? And do I take the input stuff off first?

Just undo the screws around the outer edge of the back panel, leave the jack plate alone, just be careful when you take the back off, see if there is enough slack for you to move the back without the jack getting pulled on

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Alright, big problem now . I opened it up, and found out now that both the bottom speakers are not even connected. How do I go on soldering these?

EDIT: Or on second thought, do you not even need to solder 'em or anything? This is the first time ever dealing w/ this shit so I'm clueless at the moment.