Importing Into iTunes

I have a couple uses for having Hazel import files into iTunes, but I'm not sure how to make sure Hazel won't mess it up. For example, I'm in the middle of converting my "Soap" DVDs to Apple TV format. I could get Hazel to watch the destination folder and import them into iTunes, but how do I know Hazel will wait for the file to finish being converted? Will it detect the file is in use during the conversion and not import it until it's done?
Secondly, I use Beyond TV to record TV shows. Since the shows don't look very good while playing through Beyond TV, I move the shows to my laptop, edit out the commercials, send them back to the Beyond TV computer and have BTV convert them to Apple TV format and dump them into a particular folder. When my Mac isn't being a pain and can access that folder, Hazel moves those files to a folder on my external hard drive called "Import". This is where I run into a similar concern as I mentioned above. If I set up a rule to watch "Import" and then have Hazel import those files into iTunes, how do I know it'll wait until Hazel has finished moving the file before it tries to import it? I already come across a few incomplete recordings, I don't really want Hazel to start adding to the problem. Is there anything in Hazel that can tell it to make sure the file is complete before it imports it into iTunes?
Secondly, I use Beyond TV to record TV shows. Since the shows don't look very good while playing through Beyond TV, I move the shows to my laptop, edit out the commercials, send them back to the Beyond TV computer and have BTV convert them to Apple TV format and dump them into a particular folder. When my Mac isn't being a pain and can access that folder, Hazel moves those files to a folder on my external hard drive called "Import". This is where I run into a similar concern as I mentioned above. If I set up a rule to watch "Import" and then have Hazel import those files into iTunes, how do I know it'll wait until Hazel has finished moving the file before it tries to import it? I already come across a few incomplete recordings, I don't really want Hazel to start adding to the problem. Is there anything in Hazel that can tell it to make sure the file is complete before it imports it into iTunes?