I'm in the process of moving from vB to XF but I think it would be best to do the customisations and everything and make sure that it all works if there are posts/threads there. But it is advised that we should not create any content if we want the imported posts/threads to maintain their IDs so how should I go about it? Can I create content, do the customizations, see if it works and then delete everything before doing the import? Or can I do the import now, do the customizations then delete posts & threads to do a latest import? It would be better, I think, if I can import and do the customizations on the real content that we have. But how do I delete all posts/threads/nodes after that so I can do a latest import just when making the switch?