If you are doing the lights under climate control panel is fairly easy. Pull off all the nobs then remove the face plate of the climate control panel. You can remove the panel by carefully pry it loose from the rim. It's a one-man job.
If you are doing the instrument cluster, goto http://www.volvospeed.com for detailed instructions. Don't try to do it all by yourself, get a buddy to help. I did try once to replace the bulb under the clock, ended up with cuts all over my hands!