Switching maine line with a branch line

Hello I am trying to figure out how to replace my main line with one of the branches in my project, I took someone’s suggestion and used Tortoise SVN to switch the contents of the branch folder and the trunk folder and this seems to work on a small test project I created. I also made a couple of changes to both lines and was able to commit those changes without any problems. My concern is with conflicts I may have and if anyone with changes in a working copy of the original trunk will have a conflict? Is there anything else I should take into consideration, and is there any way I can use the modeler or a simpler approach to accomplishing this?
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