lean OS Install-Windows 7 Ultimate/Home OEM over Windows 8

Tech forum noob here. Quick & possibly dumb question for you Windows 7 & 8 tech people out there.

I have OEM discs for Windows 7 Home & Ultimate as well as corresponding product keys. I can't stand Windows 8 or 8.1 on my Lenovo any longer. I want to do a fresh Windows 7 install on my Windows 8 laptop. I'm adept at reinstalling Windows 7 operating systems on any Microsoft Windows machine (pre Windows 8).

With OEM Windows 7 discs, I essentially wiped the 1-3 partitions clean and combined them to create 1 raw partition to install whichever Windows OS I happened to be installing on any particular MS Windows computer. I think I have like 8 partitions on my Windows 8.1 Lenovo.

Before I get to the point of no return on this, can my Windows 7 OEM discs successfully delete 8 partitions to create 1 partition to install an older OS on a Windows 8.1 Lenovo? (I have valid product keys).

Yes, you should have that option at the beginning of Win7 installation.

Quote from this post:

Note: If you want to install Windows 7, you must disable Secure Boot, because it is not compatible with Windows 7. But if Windows 7 64-bit installation does not succeed in UEFI Boot Mode (if you have an OEM PC that came with Windows 8 preinstalled), try installing Windows 7 in Legacy BIOS Boot Mode, but then you will need to delete all partitions.

edit:

First, try this: http://www.eightforums.com/installa...preinstalled-windows-8-laptop.html#post355517