Humidity, and bad sheds.

[Bogertophis]

It’s just very stressful to me, like I want to nail it perfectly but I just feel that I’m just not cut out for it sometimes. And since I struggle with my mental health it just makes things way harder for me stress wise and etc. I truly want my snake to live the best life he possibly can as I love him very much. But it’s just really difficult for me to do 100%, as he’s my first pet.

You didn't exactly start with an easy "first pet"...so keep that in mind too. Don't beat yourself up, it sounds to me like you've almost got this dialed in, & it sure helps to know that for this species, normal sheds often resemble an "explosion", lol. I have lots of snake experience but none with any kind of retic, so I couldn't have told you that either.
Your good intentions speaks volumes about you. And no one's perfect all the time.

As far as the vet goes, check out his actual credentials (degrees & any advanced training)...most have them framed up on their wall somewhere, but they shouldn't be shy when asked about it.