SVN Routine before editing SVN controlled file(s).
Update the whole project first to sync changes committed in the repository.
    svn update
(one thing to note about update is it doesn't update files that you have altered and uncommitted. If you really want to get an updated copy of a file then just delete the file first or move it to a backup copy then execute update.)

View commit Log comments for possible relevant changes.
    svn log

View your own uncommitted changes, you may have some changes that needs to be committed prior to you next coding.
    svn status