Hi Dunit,
I've always done my fifth step with my sponsor and I like to have the guys I sponsor do there's with me. Why? When a person does a fifth with his sponsor, the sponsor gets to know him a little better. Better than anyone else. Now the sponsor knows who he's dealing with. Also, the sponsor is able to share himself with his pigeon through this process. The relationship usually becomes closer and more personal.
I was told early on that I can share anything with anyone. Of course, there are things that are of such a personal nature that I don't blab them out at an AA meeting because I know there are people who just can't keep their mouths shut. But, there are things I can share and the more I share, the less these things weigh on me. My load gets lighter.
So, you asked for advice. That's mine for what it's worth. It goes without saying though that the step should be done and as soon as possible. We can't move forward until each step is dealt with.