yes cable needs to get unscrewed at bellhousing and pulled back , then change shift bellows.
You udo the shift cable end at engine, pull the cable core out the bellhousing by (drive end). I run a weed whacker wire up cable back up cable and tie off on engine. Pull outer cable out leaving weedwhacker wire to guide cable back in and around the exhaust Wye pipe and flywheel cover. replace bellows. Put shift cable back in, use Power tune or some other type of lube to get cable in new bellows. I use a zip tie instead of factory crimp clamp to hold bellows to shift cable.
GET A FACTORY MANUAL! All this is shown in there and will be invaluable to help a first timer. I would consider doing your other bellows as they are likely similarly worn. Exhaust bellow wont hurt anything but driveshaft bellows will sink a boat and f up ujoints and drive seal