SVN always getting errors when I commit (Subclipse)

I have setup svn on my server and Subclipse at home. I am the only developer and am mainly using it for the backup and versioning features.

Everytime I commit my changes I get eighter:

Out Of date errors

or

Tree conflicts

Sometimes I even delete files and they don't delete on svn, in a directory hierarchy only the very last item will delete so I have to delete each folder one at a time.

How do I avoid these errors in the future?

Update: Another problem I am having is that sometimes eclipse seems to sync with the server so that when I refactor a filename it goes off to the server and does something and makes me wait, which is annoying.

And for clarity, this is a typical operation: I might change a filename, move a file to a different folder then change the contents of a file. I select the 'Team menu' and click 'commit'. Then I get all these errors above.

From stackoverflow

• Do you always svn update before modifying your files? It is mandatory.

  When deleting, you commit the deletion? Otherwise, you only delete in local

  jax : No, I don't update. I just select the commit button. Can you tell me exactly what I should be doing?

  Llistes Sugra : Before any change, you must Right click -> Team -> Update To HEAD Otherwise, you might be modifying an already modified file

  jax : But how can it be modified as I am the only person updating?

  jax : If I have to run Update To HEAD every time this will really affect my efficiency also. Is this with every file, even if I change the contents?

  jax : If I rename a folder, it instead creates a new folder with a blue arrow and put the files inside the new folder, however, all subfolders are still under the old folder name????