Anxious, skittish puppy struggling with socialization, need training advice + Dallas trainer recommendations

Hi everyone,
I’m looking for some guidance and maybe a trainer recommendation in the Dallas area (I’m near Richardson/Plano).

I have a ~15–16 week old Mini Aussie puppy who has been with me for about 20 days now. He’s very sweet, but also extremely anxious and skittish, especially outdoors and around new people. When he’s scared or distracted, his brain just shuts down, he won’t take treats and can’t focus at all.

At home, he trusts me and likes to follow me everywhere. He knows “sit,” and he’s starting to understand praise markers like “good job,” but anything beyond that is tough right now. His confidence outdoors is very low; he freezes, tries to go back home, and gets overwhelmed by small noises, new dogs, or strangers walking by.

I’ve been trying to take things slow: short walks, rewarding curiosity, calm exposure… but I’m not sure if I’m doing everything right or if I should get a professional involved sooner rather than later. I’d love to help him build confidence and enjoy walks so we can both be healthier and happier long term.

So I’m asking:
1️⃣ Any proven training tips for highly anxious and distraction-sensitive puppies?
2️⃣ Has anyone dealt with a similar temperament in this breed?
3️⃣ Can you recommend a positive reinforcement trainer near Dallas who has experience with fearful/nervous puppies?

Any advice or personal success stories would help so much thank you in advance! 💛🐶