If you don't have any editing software and you can only edit from the camera that you are using to film on you have to either film each shot you need in a sequential order that that the final scene makes scene when you play the footage back. Another technique is what film editors call amateurish is to film an entire scene in one whole shot. Film that look like they have used some sort of In Camera Editing are films such as Cloverfield and District 9, but these films also seem to have used many of the other researched techniques.