If you don't want visitors in hospital (if they're even allowed at the moment!) you can get the midwives on side for this. When my family visited, one student midwife very helpfully just HAD to come in and clear everyone out after twenty minutes to do some ESSENTIAL medical faffing. You can tell the staff you want no visitors at all and they can keep people out.
I found the second time much less anxiety inducing as I had a lot more perspective on life and parenthood and babyhood. The total panic that came with all the different advice wasn't really there as much, because I knew what had worked for our first baby and I planned to just do that again. Also, I was comfortable with the fact that it would take time to learn to love her and just because she was a screaming blob when she came out didn't mean we couldn't have a wonderful close relationship in a few months time. Being able to sit with that lack of bond and not beat myself up about it was really helpful.
The thing that made the biggest difference to me was to consciously make the decision that for six months after the baby was born, I was the most important person in the world. My personal sleep was more important than anyone elses, my personal meals were more important than anyone elses etc. Especially the sleep. Everyone else could piss off, I was looking after number one. Alas I was not waited on hand and foot by a bevy of coquettish maids and hunky footmen, but I did allow and encourage my husband to do a lot of things for me, and asked visitors to fetch and carry for me. (Though lockdown a few weeks after she was born put paid to that...) I also took up as much of visiting HCPs time as I wanted, and wasted their time with trivial questions.
I'd run myself ragged with my first, especially trying to do everything the "right" way. This time I was happy for my personal convenience to be a factor in the parenting decisions we made: feeding, sleep, nappies, etc.
Putting my sleep before anything else was the best thing I've done as a parent.