Deepthroating tips... ??

TL;DR :: tips on how to deepthroat, especially larger cocks. Like... long and girthy.

Here's the thing... I'm finally going to see the love of my life after not seeing him for 11 years... he's the biggest I'll have ever had. He wants me to be able to fully take him in my mouth, and I want to be able to do it. I'll be seeing him in like, two weeks.

I've bought a dildo that matches his size so I can practice... so far it hits the back of m'y throat and that's it my gag reflex isn't super sensitive (cause I've never been able to make myself throw up, like if I'm too drunk), but it's also not non-existant.

How do I open up my throat??