So Sorry for your loss. I feel for you. I finally visited my mom's grave after a year, only recently. It was still very hard, but I'm glad I did. I think (hope) it will be easier the next time.
Winter is right, we all do this in our own way.
It will probably be important that you take your dad, so maybe be prepared.

I might go before he comes, put some fresh flowers there, spend a little time, so that it won't be so emotional when you are there with him. That's just me.
Lot's of hugs to you.