Same advice here. A DMOZ listing is nice to have, but it's not a make or break for your site. There are many successfuls sites not listed in the DMOZ directory and many sites listed that are not successful.
Find the most appropriate category for your site, read the submission guidelnes, and submit your site. Then forget about it. If you get in great. If not don't worry about. The time spent worrying about getting in can always be put to more productive use.
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It doesn't take more than 10 minutes to submit your site to DMOZ and then all you can do is wait for them to add your site if they consider it worthy. So it's definitely worth doing but there is no way to hurry the process I'm afraid.