how to gaurantee perfect timing?

is there a trick to this? i keep hearing of people getting off by one tooth? is this just by accident? or the process of timing just not perfect? is there a method that will make sure i get the chains on the exact teeth? what about marking? im using new chains.

for example, could i just mark the points on my old chains where they meet on the sprockets, then basically "transfer" the marks over to the new chains by counting links? then just line up the chains as they were previously?

i just need tricks or tips for timing. thanx!

Dark Knight GT said:

Believe me, you'll know if you get the timing off. The car will probably knock costantly and you'll get the SES light. Get it off by too much, and you'll blow your pistons.

I think marking the chain spots would be a good idea if you can remember to keep it all straight and discernable.

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but i dont want to know if i did afterwards, my goal is to try to get it perfect the first time