Hi, im new to this forum.

Seems like a good place to ask my questions. I was just reading the stickied guide to dual booting (vista pre-installed, no cd) and this part confused me:
Shrink your Vista Partition---Unallocated Space
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"At this point it is recommended that you change the drive letter of your DVD drive by inserting a DVD or CD into your DVD drive and close Autoplay when that dialog box appears, right click the blue area of your DVD drive in Disk Management and select "Change drive letter and paths..." and click Change. From the drop down menu on the right of the dialog box that appears, select E and click OK, and then click Yes when you asked to confirm your action. Now remove the CD or DVD from your drive."
I have a recovery drive in D: already.. and I'm really confused.
What should I do?

I don't know what to do, can someone help me?
Note: My CD/DVD drive is E:
(Yes, it is pathetic to be stuck on one of the first steps, LOL)
Thanks in Advance.