I finished the BBB 3 month challenge about a month and a half ago. Great program, but you will need to seriously dial back your ambitions. Stick with BBB and do not add joker sets or FSL.
The first month will feel really easy and this is a good time to add in some bodyweight assistance work. I hit both Pullups and Dips in between sets for each of the big 4 lifts.
During the second month you will need to start scaling back your assistance work. I made the mistake of trying to keep them going and it forced me to cut back from lifting 4x per week to 3x per week. I eventually figured it out and scaled back on the assistance work.
During the third month I would strongly recommend just doing the 4 big lifts. Eat as much as you can fit into your mouth, drink some water, and then stuff as much food in your mouth as you can. Assistance completely falls off, unless you count stuffing your face with food as assistance work.
A big benefit to BBB is it really helps prepare you for FSL which is what I am doing right now. The BBB hypertrophy sets let you know exactly what is doable and what is folly when it comes to FSL.
Get after it and have some fun. Just follow the guidelines as closely as possible and learn as you go.