Concerns when attempting to Downgrade from Windows 8.1 to Windows 7 with Lenovo Y40-70

Hello
I have just purchased a Lenovo Y40-70 laptop with preinstalled Windows 8.1 OS.  I am trying to figure out how to downgrade to Windows 7 with a purchased OEM disk because of the lack of support of Windows 8.1 with many of the software packages I use for work.
After doing some research, the concept of GPT vs MBR hard drive disks kept coming up.  Until receiently, I was under the impression that to downgrade to Windows 7, I would have to convert my HDD from GPT to MBR by deleting everything that was on it and reformatting it.  This concept scares me because of the possible loss of my Windows 8.1 OS.  It should be said that this laptop is completely new and no personal data or programs have been added.
Recently, I came across a support document written by Lenovo that describes how to downgrade to Windows 7 for many of the ThinkPad computer models.  The problem is that my laptop is not a ThinkPad but was associated with the referred document(http://support.lenovo.com/en/documents/ht075596) with the use of their search wizard. 
The steps are as follows:
How to install Microsoft Windows 7 on the Windows 8-based computer:
1.Turn on the computer to start Windows 8.
2.Hold down the Windows logo key and press C to open the Charm bar on the screen.
3.Select Settings, then Power from the menu.
4.Select Reboot to restart the computer.
5.While the "To interrupt normal startup, press Enter" message is displayed at the lower-left area or lower-center of the screen, press the F1 key. The ThinkPad Setup menu will be displayed. If a password prompt appears, type the correct password.
6.Select Restart, then make sure the operating system Optimized Defaults option is set to Disabled.
7.Press the F9 key to load default configuration.
8.Select Yes.
9.Insert the Windows 7 Installation DVD into the DVD drive, then press the F10 key to save configuration and exit.
10.Select Yes.
11.Follow the instructions on the screen to restart the computer.
12.Follow the instructions of Windows 7 installation DVD to install Windows 7.
My questions are:
1. Is there any harm that can come to my PC by trying the above steps and it not working correctly? 
2. Is there any validity to the above instructions for a Lenovo Y40-70? 
3. Am I still going to have to reformat my HDD from GPT to MBR for any of this to work? If so, what do I need to delete in "Disk Management" to reformat?
Any help would be greatly appreciated!
Thank you

This is probably not what you want to hear.
The answer to question one is a qualified no. If by Damage you mean physical damage, then the answer is no. If you mean by damage to the installed OS, then if it is done improperly then yes.
Question 2 I have no clue I have never tried to do what you are wanting to do.
Question 3. I think you need to read this, http://www.howtogeek.com/193669/whats-the-difference-between-gpt-and-mbr-when-partitioning-a-drive/
But I have another option for you. Have you ever thought of using a Virtual PC on the Windows 8 machine. You can run Windows 7 on Windows 8.1 and leave windows 8.1 intact. You can also install al your software on Windows 7 and run it in the virtual environment.
Also Windows 8.1 has compatibility mode just as older versions of Windows did. Have you tried installing the software in compatibility mode?
Hoov
Microsoft MVP - Consumer Security
SpywareHammer.com

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