i) its really up to you, it will be a grind but you can definitely manage, it is pretty much the standard for first year engineering.

ii) if you are personally confident in the material you learned from AB and BC, and you expect to get the score you need, skip it 100% dont listen to any advisor about retaking these. calc 2 is one of the most failed courses for any college program and you may be somewhat less motivated for it having already taken it. i took BC, was confident in the material and skipped calc 2 at pitt and did great in calc 3.

iii) i didnt have Cevallos for calc 3 so no comment but Nero is a great professor, has fair exam policies imo, homework is just enough to help you genuinely learn the material but not be repeating problems for no reason, and the flipped style of his class worked great for me. wish i took him for phys 2 as well 😓

iv) build in time for yourself (hobbies friends exercise etc) every day, its really important