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With 600mm up to 800mm I find that I can do this indoors. You only need a 9m line of sight or so.
With the C11 I have to do that outside. Set up in the garage and look across the road in the reserve at probably 20m away.
This won't be far enough in any case to judge optics because the focus position will be a fair way out from infinity so depending on the scope you'll get spherical aberrations in and out of focus patterns but it is more than enough to collimate and center the rings in the airy pattern.
To find the guide star you need to have a finder and set it up during day time if you're outdoors so you match what you see in the scope with the finder. Everytime you collimate the star will move off center so you'll have to re-adjust that all the time.
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