Hi there,

I understand your fear. I had a lot of trouble with this one too so I'll try writing some things that helped me.

first of: we all make mistakes. And we all know better then we do. Sometimes you will not be able to reflect back on them when you're stressed and your 2yo lies on the ground, screaming and punching the ground..
(Hopefully) most of the time you get it right, but don't beat yourself up to much if you are a human beeing with own emotions and needs.

That said, part of showing your children their emotions, is teaching them how to deal with them. And one of it is shame.
So: deal with your mistakes and let your child be part of it. Say sorry! Kids have the right to know when you are the one who is wrong and that their feelings in this situation are valid.
Also: it teaches them that there own feelings are as important as yours

Another thing that helped me:
keep it simple. Don't try to give to many words. Use the first thing that comes to your mind. Depending on the mood, you can explore from there, or you just stick with the big words like "angry" "happy" "sad", ..
There will be times when you know a more specific word that just feels accurate: that's the moment you teach them that.

Talk about your own feelings:
Say when you are happy. Say when you are sad. It's a good exercise and creates an environment where it's normal to talk about it.

Take a step back.
This is the hardest one. But when you are angry at your child, try to take a step back. Remind yourself that they are not doing this to hurt or anger you, but because they don't know better/haven't learned better.
Remind yourself that this is a person. It just doesn't have the same tools to deal with their emotions as you do.
And then use this to guide your child.
Tell them "You are sad because granny had to go" and "Are you angry because mommy said 'no'?"

At least for my child, asking instead of saying helped a lot, but I think everyone is different so you have to experiment.

And last but not least:
quality time with your child. Get to know them, learn to read them.
You'll bond so much over play!
And with some nursery rhymes you can make a soft and fun start. They learn names and faces of feelings and eventually they learn how to connect them with their own.

I hope this is at least a bit of help and I wish you so much fun and joy!
It's an exiting experience