Current progress - Should I start trimming? Any suggestions on how to go about trimming?

This is my first grow, my previous post can be found here :
@fineloot/things-are-coming-along

I took advice from many of the knowledgeable guys on here. Here are the results: my current set up.

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Current plant progress:

image.png

I'm curious to know, should I start trimming? Any advice for how to go about trimming?

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