Initial alignment can be done with a tak collimator, howie glatter with a grid pattern or a hotech laser board.
You can use an artificial star at ~25m and reach focus with extension tubes at the back so you keep the distance between mirrors close to optimal.
You can also use a webcam or planetary to view the airy disc on a laptop screen if you prefer.
Final collimation do it on a real star with a 6mm or 4mm eyepiece if seeing permits.
Got some pictures here:
http://www.astropic.net/astro/C11/article.list
If you search these forums for the CN-212 resto I also documented collimation steps with photos and images of artificial star and airy discs.