Patience, gentleness, plenty of lube, and a full understanding of "hymen". Long story short, be very gentle, use PLENTY of lube, etc. 8 inch circumference is definitely a "pole" if you don't take it easy and slow. You could go the other way too and have you on your back and have her guide herself on at her own pace. Whatever works. Either way, you will have to be very, very gentle and then if you hear and sense that she has it and doesn't mind it at a certain point you can pick up the pace. I was married for a brief time and had to take my time with my new virgin bride at the time too. Your circumference is much larger than my own.