No stress mate, shimming the diffs is very important.
First add shims on the gear side of the diff to set the mesh. Put your thumb on the little gear to hold it still and then rock the large gear forward and back to feel how tight the mesh is. You should have a tiny amount of movement in the main gear. You may need to buy more shims 2 is often not enough.
Second after you have set the mesh you need to shim the other side to ensure there is no side to side movement of the diff, start without any shims with the car facing away from you put your thumb on one outdrive and your forefinger on the other and see if there is any side to side play. If there is add a shim and repeat until the play is removed.
Good luck.
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