What is it that you want to accomplish? Just to get the project done, learn to do audio post, or are you looking for great quality?
Originally Posted by doctordonkey
Or maybe I should ... hire a pro for few days
That's a great way to learn. I learned more watching a "master" for a couple of days than in months of screwing around by myself. BTW, I'm a lot more affordable than you think.
There are lots of sound libraries and buy-by-the-sound web-sites. Just some food for thought....