How do I erase and install a new copy of Mt Lion on a Mac Mini that has Mt Lion installed by previous owner?

Wish I could have phrased the question better, but here's what I need to know: I traded an older iPad for a Mac Mini. I made the trade with my daughter who, after transferring everything to her iMac, handed me over the Mac Mini with all her files, and OS X Mt Lion still installed. So now I'm ready to erase the Mac Mini's HD and install my own new copy of Mt Lion onto it. Back in the "old days" of physical media I would have no problem with this, but now that I have to download and install Mt Lion from the Mac App store, I'm wondering how to do this (easily?).

If you have already purchased Mountain Lion form teh Mac App Store, then you can boot the Mac Mini to its recovery partition and select to re-partition the disk and re-install from teh internet.  It will check to see if the Mac Mini is qualified for Mountain Lion (default for a new Mac Mini), and if it isn't, then it will ask you for the Mac App Store ID that was used to purchase Mountain Lion.  You enter your ID here, and it will verify that you have purchased it, and all will be well.  If you haven't purchased it yet, the easiest thing to do is to borrow your daughter's iMac, and sign into the Mac App Store with your ID and purchse Mountain Lion, then use the above steps.

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