sr20de

I recently bought a 1991 GXE that floats like a ***** over bumps. I tried to do a search on the forums but it keeps telling me I am not allowed to.
I am getting springs but had a question on the struts before I get them.
I was thinking of the KYB GR2s but I'm not sure how much of a PITA it is to replace the insert in the back. What's involved in doing this? Is it a simple take out bolts, drop insert in strut body, replace bolts type thing? Any other recommendations for replacement struts?

Thanks