There are a number of ways to do it. Here are three.
1. Check if your printer can do it for you. Sometimes it allows you to do it
with a manual duplex option if it is not automatic.
2. Consider printing to a pdf printer using Adobe or some other option like
PDF Redirect (you also have to install the ghost script files you can get
them there too)
http://www.exp-systems.com/
Then you can print odd and even files in acrobat.
3. Write a macro that prints the pages 1,3,5.. and then request the user to
put the pages back in the printer and print on the other side may need to be
backwards and you will need to sort out the last page printing is it blank or
not.