You can watch the sealed sword one anytime after the soul society arc. And at that point, you can also watch the first movie, memories of a nobody.
As for the 2nd and 3rd.....watch episodes until they leave for the hollow world (sorry if I spoil anything). Then you can watch those two movies without spoiling any body's abilities.
I think at least. I know if you follow that, you won't ruin anything, but you may watch more than you have to on my recommendations.
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Once a G____G, always a G____G
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