Cylinder 1 misfire and catalytic converter issue

[Lu Xun]

As for the tranny fluid, Toyota does spec it for "lifetime", but if it has been driven hard it will need it to be replaced sooner (and it doesn't hurt to replace it sooner).

Is there a guide online that shows how to replace it? I can't locate the fluid container or find any diagrams that show where the transmission fluid is. Thanks for the help btw.