Melissa, what you are saying now is a bit more informational than your original post as I thought this was an eyesight problem only. It sounds like your mirror box may have become misaligned in the fall and obviously it will be almost impossible to focus if you can't see what you are doing. Not to familiar with the Sony but the mirror is also usually involved in phase-detect autofocus so the fall could also cause some issues with that
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As I think your old camera lacked live-view my revised advise for you would be to try live-view on your new camera for tripod work and see how you get along with that. You will be able to magnify things in live view to more easily judge focus placement, regardless if you use auto focus or manual focus
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Please also consider to skip auto ISO on your new camera when working from a tripod and shooting still subjects. It will only hurt your image quality as in low light it will always push your ISO up to the maximum allowed settings even though that usually isn't necessary
Use the base ISO of your camera instead.
