Yes, just pop out the cups. I would not worry terribly about reinstall - not exactly a precision part. You can just take a dead blow hammer or hammer and block of woosd and gradually tap it in without causing problems. In 20 years of working on bikes (plus quite a few more when I was young) I never used a press on an Ashtabula. In the normal situation with the cranks off I put a block of wood accross the cup and then just hit the wood with a dead blow hammer.