how to print 2 landscape pages on 1 portrait sheet in word 2010?

Let the printer driver do it, if it can.

1. In Word 2010, keep the landscape orientation of the document
2. In Word's print pane, select '1 Page Per Sheet'
3. In Word's print pane, click 'Printer Properties'
4. In my HP printer's properties, on the 'Printing Shortcuts' tab, I select '2 pages per sheet'
5. Click 'OK' to close the printer properties window
6. Back in Word, click the 'Print' button