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In the first step, you should use the collimation cap. This will make sure that your eye is centered along the optical path. Step Two sounds good except: "I cannot see the whole circumference of the primary, though." This is because you did not use the collimation cap during Step One. So go back to Step One: The main purpose of Step One is to make sure that the secondary is aligned such that the entirety of the primary is visible in the reflection of the secondary. This ensures that any light that hits the primary, makes it to your eye. You can make sure that all three clips are visible, as well as checking to make sure the annular space between the primary and OTA is even all the way around. You may have to play with the correct distance to hold your eye from the cap and the correct distance to adjust the focuser. You just want to make sure that you can see the entire primary and that it is centered. Repeat Step Two as you did before. Secret Step Three is to do a star test to fine tune the primary: Collimation - Newtonian Telescope - Reflector - Astro Baby's Guide to A Beginner’s Guide to Collimation - Gary Seronik No-Tools Telescope Collimation - Gary Seronik Collimation Tools: What You Need and What You Don't - Gary Seronik Newtonian Telescope Collimation w/ Apertura Cap | High Point Scientific And consider buying a cheshire eyepiece/sight tube with crosshairs. They are pretty cheap from amazon: Amazon.com : SVBONY SV197 Collimating Cheshire Eyepiece, 1.25 Inch Collimation Eyepiece, for Newtonian Reflector Telescope : Electronics