I installed Maverick It turns off for no reasons, makes Safari a miserable experience, and more.  How can I get back to Mountain Lion?

Maverick is a mess, well up to MS at its best.  i installed it over Mountain Lion on a base Air that initially came with Lion.  The worst is when the screen suddenly goes blank.  After a few times, i found tha tsimpy pressing the power button brought up the welcome screen which - after the password - took me back to where I was with no loss, bu tthe first time was horrible.  Then WORD for MAC started behaving strangely, with normal operations simply not working - shading to copy or cut out, for instance.  Click again and again, no shading - then suddenly it workds!  Safari has similar issues.  So too with other software downladed earlier.  simply nothing works as well as all did under Mountain Lion.
So, I want to deep six Maverick and get back to Mountain Lion.  I assume that if I use CONTROL R I will simply reload Maverick.  Can I download Mountain Lion from the App Store and then ???  All the copying and such - a half day lost.  Is there are easier way? 
<Edited by Host>

It's Command-R, not Control-R. You won't lose your files or settings if you reinstall 10.9 this way. Why don't you give that a go before reverting to 10.8.
http://support.apple.com/kb/PH13871
Enjoyed the Sarah Palin crack, btw.

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