New boat owner a bit confused - cord blocking mainsail

Your wires might stretch a few mm, and it’s easy to note the position of rigging screws. I’ve always had my rigging made up remotely, never had any trouble with length. You might want a tension gauge of course. I use one on our diamonds, and then check the pre bend by measuring.
 
Your wires might stretch a few mm, and it’s easy to note the position of rigging screws. I’ve always had my rigging made up remotely, never had any trouble with length. You might want a tension gauge of course. I use one on our diamonds, and then check the pre bend by measuring.
You have possibly done it a couple of times & know what you want.
How can one expect a total beginner to know what to do, without practical guidance?
 
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