hey im relatively new to this rom thing and I need a step by step guide how to install ultimate droid 8 on the moto droid from bugless beast 0.4. I have tried many times and get errors. im also using a mac if that changes anything. thanks
There really is no "guide" for this. But let me take a crack at it.

Ok. U downloaded from here to your mac then moved the .zip to the root of the sd card correct? Do u use rom manager? If so, select install from sd card, select the .zip, select both back up current rom AND wipe data. Allow minutes, not seconds, to restart after install.
If not using rom manager, go into recovery to install. Are u using clockwork or spr?