Viz in the BH varies a lot day-to-day. It's usually 15-20ft, but can be as much as 100ft. Similarly light levels can vary from bright and cheerful to dark and sombre. My general feeling is that it's not a dive for an inexperienced diver, but so many of those have dived it and proved me wrong.
Don't worry about being with an insta-buddy. The dive is conducted as a group dive, and you'll be surrounded by divemasters. After one or two incidents in the (distant) past, these days these guys are very attentive indeed.
The dive is to the best part of 150ft (don't believe people who say it's 130ft, although you can of course stop at that depth). What makes it different is that the BH is slightly conical, widening as you go down, so you really are hovering over absolutely nothing. The bottom where you'll be is at around 425ft, which for most people might just as well be infinity.
If you'd like to do the dive but don't want all that in one go, why not go to a small dive centre that will train you to dive that deep? I've often taken people down over several dives to those depths, but on our local barrier reef where for the whole dive you're just above a gently sloping bottom. That removes most of the "terror" factor on the BH dive, as you know you've already been to those depths perfectly safely, and I hope enjoyably.
I've dived it probably 100 times, including going to the bottom three times.
If you want that sort of progressive introduction then just PM me.