Re-installing Snow Leopard onto an upgraded Lion Macbook Pro

I have made the decision to re-install Snow Leopard after upgrading Snow Leopard on my Macbook Pro to Lion the day it came out. I've just had too many issues with Lion since I upgraded and can't seem to get them fixed! Apps not working (i.e. Microsoft Oultook 2011 failing, Time Machine not working as per Snow Leopard, Circular timer on for up to 20 minutes before I can use the machine,etc)
Therefore I wondered if someone could give me the best way to re-install please? How do I format the hard drive completely and re-install? Also I have a Snow Leopard upgrade DVD and wanted to double check I could re-install the full OS with this? I think from looking at other forum entries that this disc does have the full install, but obviously don't want to blow everything away only to find that this DVD doesn't work!
cheers

See Kappy's going back to SL from Lion guide.

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