one more quick question. If I import 2.0 over here. It won't affect my current site on SMF correct? I can basically be running that one while im ready to switch over. It just installs a copy onto here, then when im ready, I can import posts and such things from the initial import over to catchup to current date.
Yes, it's true, you can do a test import from SMF to XF while leaving your current board active. So, for example, you may want to set up a copy of your existing SMF site, upgrade that to SMF 2.0 and then import that into XenForo. You can then spend some time testing, getting familiar with XF etc.
However, when it comes to eventually completing the import, you will have to do it all again from the beginning into a clean XF install with no existing data. It is not possible to do a partial or incremental import.