No need to disassemble the tranny, just the transmission pan. Drain ATF fluid. You should have a drain plug for it. Work from rear of transmission pan, loosen all trans pan bolts. Once the fluid trickles slow, remove the pan bolts, working from rear as it is easier for the fluid to drain. Remove the pan and you will see the filter. There should be a couple of screws to take out to remove the filter from the transmission.