Problems with Yosemite update and hardrive space! How can I install and use macbook again?

I went to upload Yosemite but didnt have enough space on my hardrive. Now when I turn on my computer it tries to install - gets to about 15 minutes and then stops and says theres a problem extracting files from essential.
There isnt enough room on my hardrive to install Yosemite. I now cannot use my macbook. I cannot access any of my files, documents, apps, itunes ect. I dont know how to free up space on the hardrive when I cannot access anything.
tried to boot in safe mode but it will not let me. Stuck and unable to use computer. HELP!

Install Mavericks, Lion/Mountain Lion Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.

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