The best method, is to photo-document the process, yourself. By taking photos of the areas you are most concerned about and at the frequency you see fit, will suffice when putting the project back together.
There is no such thing as a computer program...maybe a electronic file of the Factory Assembly Manual will assist in the process, but it may be too generic, especially if you are that concerned with your ability to remember how it came apart. A digital camera is a rather important tool for the shop, when doing a complete disassembly and re-assembly.
Good luck with your project and keep us posted on your progress.
