This is huge, anon. Crossing my fingers for you that you vibe well with the therapist. Good on you for taking this step.
Honestly, it just takes time. Take it one session at a time and give yourself the time to open up and see if you like the therapist.
You have gotten into this spot for a reason and a good therapist has the means to help you feel at ease with working with them. You'll be a team and you'll do the therapy work with their guidance.
You can always voice your discomfort, too, and just be mindful of your resistance until it softens. Trust takes time.
A therapist is a powerful supporter because it is their job to help you and mirror you. You can lean on them without guilt or shame, they get paid for that.