Narrow Wide Chainring Install (104 BCD ) 

So there is no need to shorten your chain on that bike? Just chainring replacement and that's it?

Do you need an equal number of narrow and wide chain links ? does the joining link count as a wide link ?.

Don't you need to shorten the chain ?

What's benefit of narrow chainring?

This sort of work is too easy , you need woolen gloves to make it more challenging .