I do understand what you’re saying.
Yes, the courts generally go with the CAFCASS recommendations and I have also heard that magistrates are more inclined not to deviate from them.
The best advice will come from your solicitor who has the full facts but based on what you’ve put here, I think you need to accept that overnights will happen. I suspect that even when your DS is older and verbal, you’ll still feel anxious. And if the verbal part is so your son can tell you when things with Dad aren’t right - the threshold for getting contact changed on the reports of a young child is high.
Dad is going to have a steep learning curve. He will learn to do nappies and to find a routine and how to soothe your DS if he gets upset. Lots of parents can’t boil an egg but still manage to feed their kids and care for them overnight. It might not be up to your standard but it will pass as “good enough” parenting.
The worst thing you could do if the CAFCASS officer is saying you’re being obstructive is to give them reason to think that. They’re possibly more likely to order a faster schedule of contact or potentially more contact if that’s the case. That’s why I suggested sticking close-ish to the recommendations but perhaps proposing that it’s increased a bit slower, or that it’s not every weekend and that holidays are done incrementally etc. You still have the opportunity to make a proposal to your ex before you go into court and if your ex agrees, that can be made in an order made by consent rather than having a fully contested hearing. Judges and magistrates prefer that.
Your DS will still be spending a huge majority of the time with you and he will be able to feel secure in that. This obviously will be change for him and he’ll need you to support him with this change.
I would strongly recommend getting some support with your emotions - they’re completely reasonable emotions to have and it’s still important that you’re able to manage them. Children pick up on far more than we realise and if you’re anxious and upset, he will likely be too, even if you’re putting on a brave face.