Business Cards Alignment in MS word 2010

trying to print my own business cards all logo design is done, trying to print on a4 card stock paper and then want to cut them myself, however cannot get both sides to align in microsoft when i am printing them, need someone to help me as im obviously doing something wrong in the print or layout options. this is just a quick 5 minute job, just need someone to look at my documents and save appropriate settings so that i may print them properly.