Help printing in word please

I think there's some settings in "page setup" that you can fiddle with but not sure what ones exactly - sorry that's a bit rubbish isn't it?

ETA: I think changing your page setup to "booklet" is the way to go - that way your margins will be mirror images of each other. Alternatively there's a bit in your print dialog box that says "pages per sheet" you can change to 2.

I think it's under format and if you create 2 colomns that should work, then change the orientation of your page to landscape (in page setup i think) then you should have 2 A5 letters side by side

Set it up as normal in A4, copy and paste onto the next page so that you have 2 identical pages, then when you print change the settings to print 2 copies per page, this should then print out 2 copies side by side on an A4 page.