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Get a good cheshire from either of the above suppliers and follow the instructions.
Don't be afraid of collimation it is a must do if you have a reflector. Basically you centre to secondary in the focuser by using the large centre screw, centre the primary in the secondary by using the three small screws on the spider, then centre the secondary in the primary by using the large collimation screws on the mirror cell.
First time you do it it will be a real pain but then you will start understanding it , then its a quick tweek each session and you are away. Have a go, you will be surprised how easy it becomes.
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