Currently Being ModeratedJan 19, 2013 9:49 AM (in response to Jon P D)
Yes you may do that. But do not forget to empty Trash. You may also download from the Internet OmniDiskSweeper (free) and open it. It will show you all of your files and the respective sizes. Delete or transfer to an external HDD what you do not want.
Look at these two extracts from the Pondini website which you may find informative.