it is kind of crude, but i definitely use photos to assist in my setup. i will take a picture of the old bike on a trainer in my garage/basement. i mark the location of the trainer and the camera, or i just keep both still until i get all of the parts switched over. i then take another picture of the new bike. i use GIMP (free) to overlay the images and adjust the transparency. this works really well for me in terms of adjusting things that aren't so easily measured like bar tilt, shifter angle, saddle setback, and saddle angle.