Race Worries

I've been running for a few years and have run several half marathons and a full marathon. I usually train according to my plan and stand at the start line feeling quietly confident that my training will get me through the race comfortably and in the time I'd prepared for, if not a little quicker.

This is not the case for Saturday! I know that I can do the distance but I have no idea how to pace myself. I usually run with a Garmin and a virtual partner set to my target race time but if I don't know my target how do I approach the race? So I'd like your opinion....

Do I run with my Garmin and virtual partner? If I do, how can I determine my VP time if I'm not even sure myself?!

Do I run with a pace group and no Garmin, with the option to drop back to a slower group if I'm having a tough time?

Do I run with no Garmin at all and just enjoy the race whatever the pace?

Please leave any comments below... I need your help!!