OOP344 - How do I use SVN at home

After using the svn, I found some difficulties when I update other person's files.
I may have changed something in other person's part. Other person may not agree that. After I did a SVN update, what I have wrote for other person's are gone.
What I'm doing now is:
1. make a copy of the svn folder.
2. I do everything in the copied folder.
3. After I have done the changes, I copy my part code to the svn folder, and do a submit on my part code only.
4. Then I do a SVN update, merge other person's code manully one by one to my copied folder.
5. Then I continue debug the project in the copied folder.
6. repeat from step 3 to 5 until the project finished.