We cannot give you technique tips, so do not ask for them, please. What we can tell you is that for a properly and safely executed handjob, you put a condom on him, get some water-based lube (KY should work just fine for this purpose -- do NOT use Vaseline or lotion) and have a go. If you don't want to use a condom, use a latex glove (on your hand, not on him!!!)

And tell your friends. If they're like, "What? Condom for a handjob?" don't be fooled. They're just uninformed. After all, how many of them have the word "sexpert" tacked to their screen name