Having done all the hard work you need to keep records of it!
The worst would be to loose that little details or sheet of paper you wrote on it something that seems trivial at the time but is very important...

So here are some advices
• Have a redundant system of recording the experiment
  • A video recording of all the experiments
  • A notepad (NOT loose sheets) where you write down anything you notice, even the most futile thing.
  • Write name/ID of the participants in all the material that relates to them, notably questionnaires if applicable
• Archive your measurements and results in a redundant system
  • On your computer
  • In a folder with all the paperwork
  • On a CDROM