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I agree with Glen, get someone professional to do it.
If you do go ahead, make sure you use more than one camera just in case you get a failure (e.g. Card). I once did a friends wedding using a medium format film camera and used my SLR as a backup. Somehow the photo lab botched one roll (of 2) of the medium format film , I had one perfect medium format roll to work with and another good roll from the SLR so all was OK. Make sure you have sufficient memory cards for the job and preferably an additional card in the event that one fails. Make sure that you have more than one fully charged battery as well.
Flash will be a problem for you if all you have is the internal flash on the Canon, if you're shooting in daylight the Canon flash may be quite useful for fill. Be aware that the flash from the 450D will produce harsh images with shadows if it's the primary source of light.
If you're mixing flash with indoor lighting you may get shots with a mix of colour temperatures which can be almost impossible to correct in post processing.
Make sure you shoot raw, that will give you more options post processing.
I'd be doing some practice runs preferably under the same lighting and location conditions as you will be shooting in.
If you're thinking of renting a lens the 24-70 F2.8L would probably be the best option, at F2.8 it's faster than the 24-105 and will achieve better bokeh (out of focus) effects at maximum aperture. On the subject of zooms, you really don't want to be running around and having to constantly change lenses.
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