go to your nearest parts store and rent/borrow/buy a pilot bearing puller. once you have the tool, you'll know how to use it and it'll take you like 30seconds.
OR
find a bolt or something that fits very snug inside the pilot bearing. then fill the hole with as much grease as possible. stick the object in the hole and tap it firmly (but don't wale on it) in. remove it and add some more grease and repeat. the heavier the grease, the better it works. when you tap the bolt, rod or whatever you're using in, the grease will try to get away and start to push the pilot bearing out.
OR
go rent/borrow/buy a pilot bearing puller. it's so much easier. and you don't run the risk of scarring up the orrifice and not being able to get the new pilot bearing in properly.