I think girth feels bigger than length. But both do their thing.
I think the first proper big heavy thick dick I had I was pretty high and had been out at a club. It was at a cruise club ... we went into a cubicle and started kissing. His kissing was mind blowing. He was a jock looking buff blonde guy (i usually prefer darker features). But because of the passionate kissing and how turned on I was, I don’t remember it hurting at all. Drugs probably helped lol.
But I’ve had bigger than him since and the same thing ... if the connection and foreplay is there, and he works it gradually in, it makes it easier to take it.
I’ve had guys just shove it in before and it can be hard to get over the initial pain and relax into it. But I also know some bottom guys who don’t mind just getting straight into the fucking.
All that fails, you can try poppers hahaha