Hold the u bend with one hand tight so the whole lot doesn’t twist and use some water pump pliers in your other hand to loosen it,be careful not to mangle all up though.
Jar opener, as in a rubber band? If so then yes or use two hands just to get it moving then one hand on the pipe as said above. It shouldnt be glued or anything.
You should be able to get most or all of the bits out by unscrewing other fittings. Then you can get it on the bench to tackle the problem one. You might need to include the sink adaptor in that, there's a screwdriver slot in the middle of the plughole. You need to do that anyway in order to clean it up and cure the leak. Maybe just needs to be bit tighter, there's a big rubber seal, but that's unlikely to be damaged.
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