Issues with ISO size have been a subject of discussion for awhile. The
ISO will not fit on a RW disk, but will fit on an ordinary CD. I use
DVDs (RWs) which are cheaper and easier to find. I prefer a usb
installation, though because it is faster. I use Unetbootin which is
available for Linux and Windows and it makes a bootable usb key. You
may need to alter the BIOS to boot from usb or to use a boot manager.

There is no problem opening the ISO in Brasero or K3b and then
inserting a DVD instead of a CD, even if the image is made to fit on a
CD.