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I have found it is usually easier if the programmer has access to your database file and can then use certain fields of your database to generate the meta tags. Some people have outsourced this job overseas. If you are only looking to do a few hundred pages you may just want to hire a work at home mom.
Without knowing your site and your data it is hard to recommend the best solution for you. I would suggest you identify your most important pages and invest the time to manually perfect those meta tags.
ps i assume you are talking about title tag and meta description since the other meta tags are usually not very valuable to webmasters