How to give a good handjob?

I want to give my boyfriend a handjob, but I'm not really sure how. I'm really inexperienced and I'm nervous because I have no idea what to do, and I'm also kind of nervous because I know he could probably just do a better job himself. I've never touched a penis before (we're both 17) as intimacy makes me kind of nervous in general. My boyfriend is always so willing to do whatever he needs to in order to please me, so I want to please him too. How can I give him a good handjob? What are some rookie mistakes that I should avoid? 

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