I'd say first try laying on your back and hang your head over the edge of the bed. Open your mouth really wide. Have your guy stand next to the bed and slowly (at first) feed you his hard dick pushing it further and further down your throat. He's basically doing all the work. Once your throat is used to it you can switch things up and start bobbing without any gag reflex. Keep us posted on your progress.
I'd be inclined to say that this position works best with up curved and straight cocks, a down curve would be hitting upward into your soft palate, and have to make more of a turn if it is long enough to be throated. An upward ("U"curve) cock would side along the tongue and into to throat with minimal excess bending. Same with a ramrod straight dick.
Also, and this is for me, it takes a lot of trust that you partner will have enough awareness of your body signals and self control, to not gag or hurt you, or go to fast to where you can't catch an adequate breath. Try placing one hand at the base, to have more contact and be able to push back if needed.
In any position, I find that there comes a point about 70% og the time, where tp really get him all, I need a bit of help. My body refuses to relax to get him down. I place his hands on my head, and nod, and he knows to gently, but firmly, ease it down my throat. He helps me over that sticking point I described earlier. I especially need this assistance if I am approaching it from a more challenging angle. As I said, he has a left curve U bend. So approaching it from the right ( ok i am giving him a bj, him laying on his back, me on his right side, head angled downand left) means it wants to go in a way opposite my natural curve. His dick is aimed at my sinuses, not throat, lol
Well on the one curve. The up curve works to well, so I can get more of his cock in as I maneuver mr head and jaws to engulf more os him. He'll this is a challenge is we are 69ing it, as then his cock is pushing obscenely on the left side of my throat with the glans, and the right side with he right center portion of his shaft.
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What was I talking about?
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Oh! Yeah my point is that, while all of these positions are good, YOU will have to figure put what makes sense for YOU.
A word on the head dangling of bed side...if he has low hangers, they can block your nostrils and make breathing...problematic, lmao!