I usually mold small format books a5 with acrobat reader or LibreOffice:
Adobeacrobat:
1) Print Option:
Page scaling : booklet printing ; back side only
2) first print
3) I realigned the sheet and put them back in print
4) Print Option:
Print range, subject: reverse page
Page scaling : booklet printing ; front side only
5) Final print
LibreOffice
1) In general tab:
Properties, Paper Size, A4
2) Layout tab: brochure: Include Back Sides
3) First print
4) I realigned the sheet and put them back in print
5) In general tab:
Properties, Paper Size, A4 (in my case this prop. is reset on every print)
6) Layout tab: brochure: Include Front sides
7) Option tab: Print in reverse page order
Final print
at the end bind the prints with a opened staple