Advice please on Installing OSX Lion on a Partition for FCP7

Always best to ask for advice before messing with the Mac!
I have OSX 10.8.5 Mountain Lion installed on my late 2009 27" iMac, I installed that after a recent complete drive failure thinking that a more up to date OS would be a good idea, in part it was but my most valuable application FCP 7 Studio behaves oddly now especially with key commands and some timeline functions are screwy. So I want to install OSX Lion on a partition on the HD and run FCP7 on that partition. FCP 7 behaved just fine under Lion.
I have made a 700 gig partition on the iMac's HD, and I do have an installation copy of OSX Lion that I downloaded from my App Store account. That is at the moment on my regular iMac's Mountain Lion partition in the Applications folder. I also have a copy of it on an external drive.
So my question is how can I install Lion on the newly created partition, and do so safely? What are the procedures for this?
I have my FCP 7 Studio disks so I will be able to reinstall that on the new Lion partition afterwards.
I'd appreciate any step by step help or pointers to where I can find those instructions. Having messed up with the iMac last month I am nervous about just diving into this without " professional help"!
Many thanks,
PM

Ok, worked it out myself….all's well now.
PM

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