Can somebody please help me? I'm having trouble with Mac OS X Lion.

Ok so, I left my screen-saver on all night, without the adapter plugged and it had died over night, I thought since it would just die on its own it won't be as bad...but when I tried to restart it, it was stuck on the apple icon and continuously kept loading. So I grabbed my phone and looked up how to recover my Mac and in which it worked, bringing me to the Utility Panel. But now, I want to reinstall Mac OS X Lion, but it won't allow me, because my files are too full and I can't get back on my homepage, to delete them by the Start up disk. So, how can I delete all the files and re-boot Mac OS X Lion? Or how can I safely back up my files or more "free spacing"? I don't have an extra hard drive disk or anything. So I was just thinking about completely re-starting everything. 0 files for everything. So, someone please, please help! This is really getting on my last nerve /:

Without a backup drive to use you can only free up space by deleting files:
Freeing Up Space on The Hard Drive
See Lion's Storage Display.
You can remove data from your Home folder except for the /Home/Library/ folder.
Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
Also see Freeing space on your Mac OS X startup disk.
Remember that must moving files into the Trash does not delete them completely. You must also Empty the Trash in order to recover the space they occupied on the hard drive.
Beyond that you can install from scratch:
Install or Reinstall Lion from Scratch
If possible backup your files to an external drive or second internal drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your startup volume (usually Macintosh HD) from the left side list. Click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Erase button and wait until the process has completed.
Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

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