Actually if ADB scares you or you don't have it on your PC you can doo everything directly from the Incredible with terminal emulator from the market. Thee commands would be basically the same...
mount -o remount,rw -t yaffs2 /dev/block/mtdblock4 /system
mv /system/media/bootanimation.zip /system/media/bootanimation.bak
cat /sdcard/bootanimation.zip > /system/media/
OR
mv /sdcard/bootanimation.zip /system/media/bootanimation.zip
sync
reboot
It will reboot with the new animation, this way is easier if you don't mind using the virtual keyboard.