Blowjob tips?

So I’ve recently been giving my boyfriend blowjobs (I’m new at it) and he’s very patient with me and all that stuff but I know that he’d enjoy it more if I could go deeper in my throat. The thing is, i have a horrible gag reflex and i can only go down about half his penis before almost throwing up. Are there any tip to remove the gag reflex or how to deep throat with ease? Maybe some positions could help it slide easier down my throat?