Need Advice About Sex 😩

I’m planning a steamy night with a guy that I’m having sex with but his dick is really long 😩 usually when we have sex I have to tell him to pause for a sec or switch to another position bc it hurts so bad against my cervix. When I ride him thats the only comfortable position But on this particular night we have planned, I want it to go more smoothly and try new positions without it hurting. Please can anyone give me any advice?