In After Effects you can make a special keyframe that holds until you make another keyframe to change something. You can also copy and paste keyframes.
In FCP I don’t see any way to do either of these things and I’ve looked.
So if I want a particular layer to change position at let’s say, 45 seconds, then hold until one minute, then change, I can’t grab the little keyframes of my 45 second setting and copy and paste them to the last frame before my one minute setting. My little animation will start moving toward the one minute position right after the 45 second mark unless I go to that last frame before the minute and copy those 45 second settings–which I failed to write down–into the transformation. Also ‘reset parameters’ doesn’t work very well. I’d hope it would delete all keyframes but it doesn’t. I have to go back and delete them one by one.