Modifying installation ISOs

Unfortunately, I've used up all my CDs, but there are still plenty of blank DVDs. I'm wondering if I can modify the ISOs so that they can be burnt into DVDs (no idea how). There's already a DVD ISO, but it's rather large for download and I only require the first CD.
 
Just burn the iso for the first CD to your blank DVD? I've burn memtest/system testing .iso's, Linux iso's and even WinXP iso's to my DVD+RW and I've never ran into an issue. I don't see why FreeBSD would be any different?

Someone correct me if I'm wrong.
 
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