You will get it setup easily after a couple times.
I too was like you and after being newly certified with 16 dives after OW/AOW (and some discover scuba) and then I did my 2 first "real" dives after certification using a jacket style BP/W down in the keys, I wanted to buy all of my own gear. To make a long story short, I went with a BP/W as well.
I ended up buying a tank too so that at home I could setup everything just as I would at a dive site. After doing that and getting my adjustments down, I tried it in a pool for the first time, and I actually needed to make like no adjustments. I was in a pool with a wetsuit on and even with no weight, I sunk like a rock.
I then took it to a pool once again after making some adjustments at home and I felt I was ready to go.
Last week I took it into the ocean for the first time and it was fantastic! The setup was actually VERY easy for me. I put it all together at my hotel and just tossed it in my dive bag before going to the marina to get on the boat and dive. On the boat, I setup all of my own gear. It took me a few adjustments to get the cambands to fit tight, but after that, everything was ready to go.
I too didn't know what weight I needed since in the pool with the exact setup I sunk like a rock, so I went with 2lbs in each trim pocket, for 4lbs total. It felt perfect and that is what I went with. Prior, when using jacket style rental BCD, 6lbs was perfect for me.
I was also pointed to this style cam bands which cost a little bit more money but are a lot easier to get on/off, and I am glad I did because it was a piece of cake to swap tanks on the boat between dive sites.
Edge Tank Cam Strap with Stainless Pro Cam Buckle
I also realize that after those dives that I need to get a shorter inflator hose and probably a shorter octo hose as well that I dangle around my neck. My inflator hose is 22" and I am going to get an 18" hose as I kept noticing it bowing up off my shoulder a bit since it was a bit too long, and I notice that my octo was dangling a bit further than it needed to be. I believe the octo length is 24" and I'll see if I can go lower.