how do i replace the wheel studs on a '91 civic sedian 'si.
i cant find my book on how to do it. i dont know if i can just hamer them out or do i need to get them presed.

 

You have to:

Remove the caliper
Remove the rotor
Then you will see the hub. All you have to do is hammer them out. I suggest using a rubber mallet though so that you won't damage and bend the hub. Should come right off. Just be patient. You should replace all them since you are already there. They are probably rusted anyway. Don't want to deal with the hassle of changing them lata. Good luck.

 

there is a hub bearing, it will probably get damaged during removal, you will probs have to have a new one pressed in, the part is like $50-$60 from honda.