Just have fun! I did my first one in March and it was great. Stop if you want to/need to for food/drinks or to rest. There will be club support and cars or scooters checking on people. Try to find a group at your pace for the start and join in. The hammerheads will be flying for time but you will see people on big fat tire bikes, even recumbents. Try to change your riding position and stretch from time to time so you don't get sore and drink. You WILL make it. You have the base and you can take all the time you need.