Thank you for a actual thoughtful answer.

I am absolutely not trying to show off gear, in fact the reason I was apprehensive was precisely because it was too much. I even feel awkward carrying a bulky DSLR down the street. And most of my friends own similar gear and are in film production so it's certainly not a play to impress. I have contemplated trying to trade this camera and gear in for smaller stuff but it doens't feel right given that it was given to me by a late friend.

It IS however a golden opportunity to practice with the gear as I don't often get many opportunities to take pictures of my friends. I can't exactly whip this out at a bar and it's even more awkward at a casual small social gathering.

The reason my friend left me the camera is because he always was annoyed that I didn't have any pictures up in my house and I told him I didn't really like putting up someone else's pictures in my house. This is a casual wedding filled with my closest friends in one place. It's the best opportunity to use this thing I've found yet. Being able to capture my own experience of the event IS what will

This notion of "not being immersed" in the event is a pro photographer's mindset because they are WORKING and walking around trying to do their job. I'm simply going to be snapping a few pics of my friends while I happen to be there. As you've noted, I have no intention of trying to pose people. I prefer candid shots. I'm not trying to pad my portfolio or anything. I have absolutely no interest posing people the following the B&G around.

Also, this other professional cameraman isn't necessarily there in purely a professional capacity. He's another a fellow groomsman who just happens to be a pro photographer, I don't think he's even charging them for his time. There will be at least a dozen people nice cameras if it's anything like similar weddings in this group.

Thanks for your advice.