Cattleyas generally don't mind being repotted except for bifolates which sulk for sometimes a year after being repotted. If your orchid hasn't bloomed yet I would leave it alone and let it bloom before repotting. Many Cattleyas bloom in the fall and winter. Spring is the ideal time to repot but I've repotted Catts. all through the year with success. Placing the entire pot in a new, larger one like Bud suggested is a good way to handle a large specimen plant. On the other hand Cattleyas love having their roots outside the pot. They often grow better that way. So there's no big hurry to repot except for personal preference. Good luck.
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