I wanted to give you a link to FOWNC but I still can't get the website to load - it just times out. I don't know if it's just me or if the website is down. Are you able to get on it?
www.fownc.orgIf you do decide to come and look for yourself you will definitely need the square number or it will be hopeless. Even then you would need to come early and allow plenty of time. The cemetery is on winter hours now and closes at 4 pm.
This findagrave memorial has photos of the cemetery map and a plot map.
https://www.findagrave.com/memorial/187533039/william-henry_wentworth_atkins-bowyerYou can see there are a lot of graves in each square and I hope this will give you an idea of the difficulty of finding a particular grave. Just working out where a particular square is will be hard enough as they are not marked on the ground. If you are lucky and your ancestor has a gravestone with a clear inscription you might be able to find it easily. Otherwise you will be peering at numerous worn and crumbling monuments which are barely legible.
Whether or not there is a gravestone FOWNC should be able to locate the grave. They are familiar with the layout of the cemetery and have many years experience.
Good luck.