Looking for an ESA

Recently I adopted two puppies with my ex, but following the breakup, my ex insisted she keep them both and said I wasn't stable enough for a dog.

I started the process to get an ESA letter from my therapist and have run it by my landlord who was hesitant at first but ultimately the ESA is protected under law.

My question is, how do I know when I'm ready for the dog? I've been anxious to pull the trigger because I keep worrying that I won't do something right or that I'm not prepared or that I'll struggle taking care of it with my 8-430 schedule.

Was anyone else really worried about adopting or in a similar situation? A dog helped my mental health so much previously