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Hi Tammy.
I first started learning collimation by using a cheshire crosshair. This will show you the position of the focuser to secondary mirror, then the seconday mirror to primary mirror. This means that when you look down the cheshire crosshair you will see the secondary mirror fitting exactly under it, and the reflection of the primary mirror within the secondary mirror. In the middle of the primary mirror you will see the centre spot and the cheshire crosshair should be in the middle of the centre spot. If the secondary mirror is held by a four-vane spider, you should be able to see the cheshire crosshair match up exactly with the four-vane spider. Once you have this alignment set up, you will only need a laser to fine tune it when required.
Cheers!
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