Any advice on being stepmom moving in with bf and kids officially , sans grandma?

Kate

We've already had our "trial period" of 7mo living with bf, his 2 children and grandma and in glad we're both in process of finally moving out the state away from her.

I'm nervous. I feel so overwhelmed with this giant responsibility of being "mom" but not the "real mom".

I just moved back into my home to finish school and work while he works so we can save for a place to stay with his kids and me.

Grandma was toxic and a jw , bf does not practice and has gotten shit from her and we were kicked out of her home after 7mo living with her and kids.

But in the next year me and bf will be living together again but with his 2 kids solely. Grandma officially signed custody over to her son so the kids remain in his sole custody as of now.

Any tips from fellow stepparents about moving in and not losing your mind to bio jealosy, calls from the exwife , talking back or your partner disagreeing with your methods of discipline ?

Sometimes I feel like i cant do anything right. The anxiety is eating me alive.

I came from middle class family , more or less gets along, he came from a less privileged abusive family.

Im having major anxiety about the kids clashing with me as they grow into their teens , his daughter (5) i get along with but his son (9) seems ok on outside but is aloof to me i feel , but im afraid we'll all need counseling in the near future.

Their bio mom was deported and their father refuses to see a counseler, even at my insistence.

Any advice?