What is involved to upgrade Snow Leopard (10.6.8) to Mountain Lion?

I would like some guidance on upgrading to Mountain Lion from Snow Leopard and pose the following questions:
1. Should I increase from 2GB to 4GB before the upgrade?
2. Are there enough improvements/enhancements in ML that make the upgrade a REAL positive? Any comments on specific gains graetly appreciated.
3. Can you walk me through the process?
I appreciate any help and guidance that will facilitate my decision to upgrade and assist in a smooth transition.
Thanks,
dougfromexeter

Lion Diskmaker referenced above.
Bootable Drive DVD or USB Flash Drive – Lion Diskmaker
Check to make sure your applications are compatible. PowerPC applications are no longer supported.      
Application Compatibility
You can also check which applications are PowerPC by going to the  menu, select About this Mac, click on More info…, then click System Report and select Software/Applications.
If you have applications that you want to use that aren’t compatible, you can retain Snow Leopard and create a new partition to install Mountain Lion on or you can run Snow Leopard  server in a virtual mode.
I have the same model iMac and Mountain Lion performs fine with 4 GB RAM, but I'm not a heavy video or graphics user.

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