How would I re-install Mac OS X Lion, if I have to?

I thinking of upgrading from Snow to Lion, but before that I've a question.
If for any reason I need to re-install Lion OSX, would I need to install Snow Leapord first and then upgrade to Lion?
Thanks.

Thanks Thomas,
Does it download to any conspicous place on my hard drive or do I really have to dig it out?
What format does it download to e.g. iso file, dmg file (I really don't know the difference between them though)?
I went through some earlier discussions saying that there was some hidden file and need to find that and copy/paste it to external hard drive to avoid future double-installation process i.e. Snow first and then upgrading to Lion. Is there any step similar to this? If yes, then can you spell it out for me please?
Once I do manage to copy the download file to external HD, will future RE-installation of Lion avoid Snow re-installation step, and go on straight to re-installating Lion?
Thanks once again.

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Hope this helps, for any further queries reply to the post and feel free to join us again
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Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.
Thank You,
K N R K
Although I am an HP employee, I am speaking for myself and not for HP

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moose0422 wrote:
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keg55 wrote:
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Very strange! This is what I get when I follow your instructions:

How would I re-install Mac OS X Lion, if I have to?

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